Go: package main

import (
        "fmt"
        "bufio"
        "os"
)

func main() {
        var a, b, c, d, e, f float64
        sc := bufio.NewScanner(os.Stdin)
        for sc.Scan() {
                fmt.Sscanf(sc.Text(), "%f %f %f %f %f %f", &a, &b, &c, &d, &e, &f)

                det := a*e - b*d
                x := (e*c - b*f) / det
                y := (a*f - c*d) / det
                fmt.Printf("%.3f %.3f\n", x, y)
        }
}

C++: #include <cstdio>
#include <string>
#include <vector>
#include <algorithm>
#include <memory.h>
#include <cmath>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <ctime>
#include <iostream>
#include <functional>
#include <complex>
#include <iomanip>
#pragma comment(linker, "/STACK:836777216")

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<double, double> pdd;
typedef pair<pii, int> p3i;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<pll> vll;
typedef vector<p3i> v3i;
typedef vector<vii> vvii;
typedef vector<p3i> vp3i;
typedef long double ld;
typedef vector<ld> vld;

#define pb push_back
#define mp make_pair
#define REP(i, n) for (int (i) = 0; (i) < (n); (i)++)
#define REPD(i, n) for (int (i) = (n) - 1; (i) >= 0; (i)--)
#define FOR(i, a, b) for (int (i) = (a); (i) < (b); (i)++)
#define FORD(i,a, b) for (int (i) = (a); (i) >= (b); (i)--)
#define sz(v) (int)(v).size()
#define all(v) (v).begin(), (v).end()
#define rv(v) reverse(all(v))
#define CL(v, val) memset((v), (val), sizeof((v)))
#define SORT(a) sort(all(a))
#define un(v) SORT(v), (v).resize(unique(all(v)) - (v).begin())
#define eps 1.0e-7
#define X first
#define Y second
#define bit(n) (1 << (n))
#define bit64(n) (ll(1) << (n))
#define sqr(n) ((n) * (n))

ll DET(ll a, ll b, ll c, ll d) {
  return a * d - b * c;
}

int main(void) {
  ll a,b,c,d,e,f;
  while (scanf("%lld%lld%lld%lld%lld%lld", &a, &b, &c, &d, &e, &f) == 6) {
    ll det = DET(a,b,d,e);
    ll det1 = DET(c,b,f,e);
    ll det2 = DET(a,c,d,f);
    double x = 1.0 * det1 / det;
    double y = 1.0 * det2 / det;
    printf("%.3lf %.3lf\n", x + eps, y + eps);
  }
  return 0;
}

C++: #include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;


double a,b,c,d,e,f;
double A,B;//x,y座標
int main(){
  while(scanf("%lf %lf %lf %lf %lf %lf",&a,&b,&c,&d,&e,&f) !=EOF){
    B =(c*e-f*b)/(a*e-b*d);
    A = (c -b*B)/a;
    
    A =floor((A+0.0005)*1000)/1000;//小数第4位を四捨五入
    B =floor((B+0.0005)*1000)/1000;
    printf("%.3f %.3f\n",B,A);
  }
  return 0;
}

C++: #include <stdio.h>

int main() {
	float a, b, c, d, e, f;
	float x, y;

	while (scanf("%f", &a) != EOF) {
		scanf("%f %f %f %f %f", &b, &c, &d, &e, &f);
		b *= d / a;
		c *= d / a;
		a = d;
		if ((a > 0 && d > 0) || (a < 0 && d < 0)) {
			a *= -1;
			b *= -1;
			c *= -1;
		}
		e += b;
		f += c;
		y = f / e;
		x = (-1 * b * y + c) / a;
		if (x == -0) x = 0;
		else if (y == -0) y = 0;

		printf("%.3f %.3f\n", x, y);
	}

	return 0;
}

C++: #include<iostream>
#include<iomanip>
#include<vector>
#include<map>
#include<string>
using namespace std;
/*
??£???????¨????
	ax + by = c
	dx + ey = f
????§£x, y???????????????????????°??????
*/
int main() {
	int a, b, c, d, e, f;
	int cnt = 0;						//??\??????????????£???????¨????????????°
	std::vector<double> x_vector;		//x????§£???????´?
	std::vector<double> y_vector;		//y????§£???????´?

#if 0
	while (cnt < 2) {
		cin >> a >> b >> c >> d >> e >> f;
#else
	while (cin >> a >> b >> c >> d >> e >> f) {
#endif
		double x = (b * f - c * e) / (b * d - a * e);
		double y = (c * d - a * f) / (b * d - a * e);

		cnt++;
		x_vector.push_back(x);
		y_vector.push_back(y);
	}

	for (unsigned int i = 0; i < cnt; i++) {
		std::cout << std::fixed;
		std::cout << std::setprecision(3) << x_vector[i] << " ";
		std::cout << std::setprecision(3) << y_vector[i] << endl;
	}

	//???????????°
	//while (1);

	return 0;
}

C++: #include<iostream>
#include<iomanip>
#include<bits/stdc++.h>
using namespace std;

int main(){
    double a,b,c,d,e,f;

    while(cin>>a){
    if (a==EOF)
        break;
    cin>>b>>c>>d>>e>>f;
    double temp=b/e;
    double x,y;
    x=(c-temp*f)/(a-temp*d);
    temp=a/d;
    y=(c-temp*f)/(b-temp*e);


    cout.setf(ios::fixed);
    cout.precision(3);
    cout<<x<<" "<<y<<endl;
    }
    return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <numeric>
#include <string>
#include <vector>
#include <list>

#define DIM 2

typedef std::vector<double> Vec;
typedef std::vector<Vec> Mat;
typedef std::pair<Mat,Vec> Eq;

int main(void){
	using namespace std;

	list<Eq> input;

	double a,b,c,d,e,f;

	cout << fixed << setprecision(4);

	while(cin >> a >> b >> c >> d >> e >> f){
		Vec m1, m2;
		m1.push_back(a);
		m1.push_back(b);
		m2.push_back(d);
		m2.push_back(e);

		Vec vec;
		vec.push_back(c);
		vec.push_back(f);

		Mat mat;
		mat.push_back(m1);
		mat.push_back(m2);

		Eq eq = make_pair(mat,vec);

		input.push_back(eq);
	}

	for(auto itr = input.begin(); itr!=input.end(); ++itr){
		auto mat = itr->first;
		auto vec = itr->second;

		Vec output(DIM);

		auto det = mat[0][0] * mat[1][1] - mat[0][1] * mat[1][0];
		std::transform(vec.begin(), vec.end(),vec.begin(), std::bind1st(multiplies<double>(),1.0/det));

		mat[0][1] = -mat[0][1];
		mat[1][0] = -mat[1][0];
		swap(mat[0][0],mat[1][1]);

		for (int i=0; i<DIM; i++){
			output[i] = inner_product(vec.begin(), vec.end(), mat[i].begin(), 0);
		}

		cout << output[0] << " " << output[1] << endl;
	}

}

C++: #include <iostream>
#include <iomanip>

int main()
{
	double a, b, c, d, e, f;
	while(std::cin >> a >> b >> c >> d >> e >> f) {
	    double A = e;
	    double B = - b;
	    double D = - d;
	    double E = a;
	    double det = a * e - b * d;
	    double x = (A * c + B * f) / det;
	    double y = (D * c + E * f) / det;
	    std::cout << std::fixed << std::setprecision(3) << x << " " << y << std::endl;
	}
	return 0;
}

C++: #include <iostream>
#include <cstdio>
using namespace std;
int main(){
	double a, b, c, d, e, f;
	double x, y;
	while(true){
		cin >> a >> b >> c >> d >> e >> f;
		x = (e*c-b*f) / (a*e-b*d);
		y = (a*f-d*c) / (a*e-b*d);
		if(x==0) x=0;
		if(y==0) y=0;
		printf("%.3f %.3f\n",x,y);
	}
	return 0;
}

C++: #include <iostream>
#include <iomanip>

using namespace std;

int main(void){
    int a,b,c,d,e,f;
    double ansX,ansY;
    while(std::cin >> a >> b >> c >> d >> e >> f){
        ansX = (c*e - b*f) / (a*e - b*d);
        ansX *= 1000;
        if(ansX > 0) ansX += 0.5;
        else ansX -= 0.5;
        ansX = int(ansX);
        ansX /= 1000;
        
        ansY = (a*f - c*d) / (a*e - b*d);
        ansY *= 1000;
        if(ansY > 0) ansY += 0.5;
        else ansY -= 0.5;
        ansY = int(ansY);
        ansY /= 1000;
        
        std::cout <<fixed << setprecision(3) << ansX << " " << fixed << setprecision(3)<<ansY << std::endl;
    }
}

C++: #include <iostream>
#include <cstdio>
using namespace std; 
int main()
{
double a,b,c,d,e,f;
while(cin>>a>>b>>c>>d>>e>>f)
{
printf("%.3f %.3f\n", round((1.0 * b*f - c*e)/(b*d - a*e) * 1000) / 1000, round((1.0 * a*f - c*d)/(a*e - b*d) * 1000) / 1000);
}
return 0;
}

C++: #include <bits/stdc++.h>

using namespace std;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout << fixed << setprecision(12);
  double a, b, c, d, e, f, x, y;
  while (cin >> a >> b >> c >> d >> e >> f) {
    x = (c * e - b * f) / (a * e - d * b);
    y = (a * f - c * d) / (a * e - b * d);
    if (!x) x = 0;
    if (!y) y = 0;
    cout << x << ' ' << y << '\n';
  }
  return 0;
}

C++: #include<iostream>
#include<iomanip>

using namespace std;

int main(){
    int a,b,c,d,e,f;
    double x,y;

    while(cin>>a>>b>>c>>d>>e>>f){
        x = ((e*c)-(b*f))/((a*e) - (b*d)) *1.0;
        y = ((a*f) - (c*d))/((a*e) - (b*d)) *1.0;

        cout << setprecision (3) << fixed << x << " " << y <<endl;
    }
    return 0;
}