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("%04f %04f\n", x, y)
        }
}

C++: #include<iostream>
int GCM(int a,int b){
	if(b==0)return a;
	return GCM(b,a%b);
}

int main(){
	int a,b,c,d,e,f;
	while(std::cin>>a>>b>>c>>d>>e>>f){
		float x,y;
		int a_=a,b_=b,c_=c,d_=d,e_=e,f_=f;
		b_*=GCM(a,d)/a,c_*=GCM(a,d)/a;
		e_*=GCM(a,d)/d,f_*=GCM(a,d)/d;
		y=(c_-f_)/(b_-e_);
		x=(c-y*b)/a;
		std::cout<<x<<" "<<y<<std::endl;
	}
	return 0;
}

C++: #include <iostream>
#include <queue>
#include <vector>
#include <math.h>
#include <algorithm>
#include <iomanip>
using namespace std;

int main(){
	double a, b, c, d, e, f;
	while (cin >> a >> b >> c >> d >> e >> f) {
	long double x = (b * f - c * e) / (b * d - a * e) * 1000.0f;
	long double y = (c * d - a * f) / (b * d - a * e) * 1000.0f;
	x = round(x) + 0.000001;
	y = round(y) + 0.000001;
	x /= 1000.0f;
	y /= 1000.0f;
	cout << fixed << setprecision(3) << x << ' ' << y << endl;
	}
	return 0;
}

C++: #include <iostream>

int main(int argc, const char * argv[]) {
    double a,b,c,d,e,f;
    double x,y;
    while(std::cin >> a >> b >> c >> d >> e >> f){
        y = (a*f - c *d) / (a*e  - d*b);
        x = (c-b * y) / a;
        printf("%.3f %.3f\n",x,y);
    }
   
}

C++: #include<stdio.h>
#include<iostream>
using namespace std;

int main(void){
	int a,b,c,d,e,f;
	float x = 0, y= 0;
	//ax+by=c
    //dx+ey=f
	
	while(scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f) != EOF){
		if(a<-1000 || b<-1000 || c<-1000 || d<-1000 || e<-1000 || f<-1000 ||
			a> 1000 || b> 1000 || c> 1000 || d> 1000 || e> 1000 || f> 1000)
			cout<<"-1000から1000までの値を入れてください."<<'\n';
		else{
			if(a*e-b*d != 0){
				x =(float)(c*e-b*f)/(float)(a*e-b*d);
				y =(float)(a*f-c*d)/(float)(a*e-b*d);
			}
			else{
				if(a*b == 0){
					if(a== 0 && b != 0){
						x = 0.0;
						y = (float)c/b;
					}
					else if(a!= 0 && b== 0){
						x = (float)c/a;
						y = 0;
					}
					else if(a == 0 && b == 0){
						if(f != 0){
							printf("解は存在しない\n");
							continue;
						}
						else{
							x = y = 0.0;
						}
					}
				}
				else{ //普通にx = 0
					x = 0.0;
					y = (float)c/b;
				}
			}
			printf("%.3f %.3f\n",x,y);
		}
	}
	
	//終了
	return 0;
}

C++: #include <cstdio>

using namespace std;

int main() {
    double a, b, c, d, e, f;
    while (scanf("%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f)) {
        printf("%.3f %.3f\n", (c*e - b*f) / (a*e - b*d), (c*d - a*f) / (b*d - a*e));
    }

    return 0;
}

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

using namespace std;

void Round(double &refX)
{
    const double eps = 0.001;
    if( abs(refX) < eps)
        refX = 0;
}
  
int main()
{
    int a,b,c,d,e,f;
    double x,y;
    while(cin>>a>>b>>c>>d>>e>>f)
    {
                 
            if (a*e == b*d)
            {
                   //cout<<'No Answer'<<endl; 
                   continue;
             }
             x= (c*e-b*f)/(a*e-b*d);
             y= (c*d-a*f)/(b*d-a*e);
  

             Round(x);
             Round(y);

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

C++: #include<stdio.h>
int main(void){
	double a,b,c,d,e,f;
	double A,B,C,D,E,F;
	double x,y;
	while(scanf("%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f)!=EOF){
		B=b*d;
		C=c*d;
		E=a*e;
		F=a*f;
		printf("here\n");
		y=(C-F)/(B-E);
		A=a*e;
		C=c*e;
		D=b*d;
		F=b*f;
		printf("go home\n");
		x=(C-F)/(A-D);
		printf("%1.3lf %1.3lf\n",x,y);
	}
	return 0;
}

C++: #include<iostream>
#include<iomanip>
#include<cmath>
#include<algorithm>
#include<string>
#include<cctype>
#include<vector>
#include<queue>
#include<map>
using namespace std;

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

	while (cin >> a >> b >> c >> d >> e >> f) {
		//a*d-b*c=0:?§£??????
		G = 1 / (a*e - b*d);
		x = G*(e*c + (-b)*f);
		y = G*((-d)*c + a*f);
		cout << fixed << setprecision(3) << x << " " << y << endl;
	}

	return 0;
}

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

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

	float det = a*e-b*d;
	float x = 1/det*(c*e - b*f);
	float y = 1/det*(-c*d + a*f);

	cout << x << " " << y << endl;

	return 0;
}

C++: #include <bits/stdc++.h>
using namespace std;
//#include <boost/multiprecision/cpp_int.hpp>
//using multiInt = boost::multiprecision::cpp_int;

using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template<typename Q_temp>
using smaller_queue = priority_queue <Q_temp, vector<Q_temp>, greater<Q_temp> >;

const int INF = (int) 1e9;
const ll LINF = (ll) 4e18;
const ll MOD = (ll) (1e9 + 7);
const double PI = acos(-1.0);
const int limit = 100010;

#define REP(i,m,n) for(ll i = m; i < (ll)(n); ++i)
#define rep(i,n) REP(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << endl
#define Yes(n) cout << ((n) ? "Yes" : "No") << endl
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << endl
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x_) cerr << #x_ << ":" << x_ << endl;
#define dbg2(x_) for(auto a_ : x_) cerr << a_ << " "; cerr << endl;
#define dbg3(x_ , sx_) rep(i, sx_) cerr << x_[i] << " "; cerr << endl;
vector<int> Dx = {0, 0, -1, 1, -1, 1, -1, 1, 0};
vector<int> Dy = {1, -1, 0, 0, -1, -1, 1, 1, 0};

inline ll CEIL(ll a, ll b) {
    return (a + b - 1) / b;
}

//------------------------------------------------------

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    double a, b, c, d, e, f;
    while (cin >> a >> b >> c >> d >> e >> f) {
        double x = (c * e - b * f) / (a * e - b * d);
        double y = (c * d - a * f) / (b * d - a * e);
        cout << fixed << setprecision(3) << x << " " << y << endl;
    }

    return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;
#define all(vec) vec.begin(),vec.end()
typedef long long int ll;
typedef pair<int,int> P;
const ll MOD=1000000007;
const ll INF=1000000010;
const ll LINF=4000000000000000010LL;
const int MAX=310;
const double EPS=1e-8;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
int main(){
    double a,b,c,d,e,f;
    while(cin>>a>>b>>c>>d>>e>>f){
        double y=(a*f-c*d)/(a*e-b*d);
        double x=(-b*y+c)/a;
        x*=1000;
        printf("%.3f\n",round(x)/1000);
        y*=1000;
        printf("%.3f ",round(y)/1000);
    }
}

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

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

	while (cin >> a >> b >> c >> d >> e >> f) {
		double x, y;
		x = (double)(b*f - c*e) / (b*d - a*e);
		y = (double)(c - a*x) / b;
		if (fabs(x) < 1e-6) x = 0;
		if (fabs(y) < 1e-6) y = 0;
		cout << fixed << setprecision(3) << x << " " << y << endl;
	}
	return 0;
}