Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

var sc = bufio.NewScanner(os.Stdin)

func read() string {
	sc.Scan()
	return sc.Text()
}

func main() {
	sc.Split(bufio.ScanLines)
	for sc.Scan() {
		s := strings.Split(sc.Text(), " ")
		a, _ := strconv.ParseFloat(s[0], 64)
		b, _ := strconv.ParseFloat(s[1], 64)
		c, _ := strconv.ParseFloat(s[2], 64)
		d, _ := strconv.ParseFloat(s[3], 64)
		e, _ := strconv.ParseFloat(s[4], 64)
		f, _ := strconv.ParseFloat(s[5], 64)
		x := ((b * f) - (c * e)) / ((b * d) - (a * e))
		y := ((a * f) - (c * d)) / ((a * e) - (b * d))
		if x == 0 {
			fmt.Printf("0.000 %.3f\n", y)
		} else if y == 0 {
			fmt.Printf("%.3f 0.000\n", x)
		} else {
			fmt.Printf("%.3f %.3f\n", x, y)
		}
	}
}

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

int main()
{
        double a, b, c, d, e, f;
        double det;
        
        while( scanf("%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f) != EOF ){
                det = a*e - b*d;
                printf("%.3lf %.3lf\n", (e*c-b*f)/det, (a*f-c*d)/det);
        }
        return 0;
}

C++: #include <iostream>
#include <stdio.h>
#include <algorithm>

using namespace std;
double sg(double n); 
int main()
{
	int a[1000],b[1000],c[1000],d[1000],e[1000],f[1000];
	float x[1000],y[1000];
	int w_x,w_y;
	int len=0;
	while (cin >> a[len] >> b[len] >> c[len] >> d[len] >> e[len] >> f[len])
		len++;

	for (int i=0; i < len; i++) {
		x[i] =  ((e[i] * c[i] - b[i] * f[i]) / (e[i] * a[i] - b[i] * d[i]));
		y[i] =  ((c[i] * d[i] - f[i] * a[i]) / (b[i] * d[i] - a[i] * e[i]));
	}
	for (int i=0; i < len; i++) {
		printf("%.3lf %.3lf\n",sg(x[i]),sg(y[i]));
	}
	return 0;
}
double sg(double n)
{
	int w;
	n = n * 10000;
	w = (int)n % 10;
	if (w > 4) 
		n += 1.0;
	return n /= 10000;
}

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

using namespace std;

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


double x(double, double, double, double, double, double) {

	return (c*e - b*f) / (a*e - b*d);
}

double y(double, double, double, double, double, double) {

	return (a*f - c*d) / (a*e - b*d);
}

double round(double dat, int keta ){

	int fct;
	fct = (int)pow(10, keta - 1);
	dat *= fct;
	dat += (dat < 0) ? -0.5 : 0.5;
	dat = (int)(dat);
	dat /= fct;
	return dat;
}

int main()
{
	double x1, x2, y1, y2;
	cin >> a >> b >> c >> d >> e >> f;

	x1 = x(a, b, c, d, e, f);
	y1 = y(a, b, c, d, e, f);

	cin >> a >> b >> c >> d >> e >> f;

	x2 = x(a, b, c, d, e, f);
	y2 = y(a, b, c, d, e, f);

	cout << fixed << setprecision(3) << round(x1,3) << " " << round(y1,3) << endl;
	cout << fixed << setprecision(3) << round(x2,3) << " " << round(y2,3) << endl;

	return 0;
}

C++: #include <algorithm>
#include <vector>
#include <math.h>
#include <stdio.h>
#include <cctype>
#include <iostream>
#include <set>
#include <string>
#include <queue>
#include <map>
using namespace std;
int size(string x){
	string::size_type size=x.size();
	return size;
}
#define fu(l,k) for(int i=l;i<k;i++)
#define fd(l,k) for(int i=l;i>k;i--)
#define fi first
#define se second
typedef  vector<string> vs;
typedef  vector<int> vi;
double pi(){
	return M_PI;
}
typedef set<int> set_i;
typedef set<string> set_s;
int main(){
	double a,b,c,d,e,f,a1;
	while(cin>>a>>b>>c>>d>>e>>f){
		double x,y,x1,y1;
		a1=a;
		a=a*d;
		b=b*d;
		c=c*d;
		d=d*a1;
		e=e*a1;
		f=f*a1;
		y=(c-f)/(b-e);
		x=(f-e*y)/d;
		if(x==0) x=0;
		if(y==0) y=0;
		printf("%.3lf %.3lf\n",x,y);
	}
}

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

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

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

    f /= e;
    c -= b*f;
    c /= a;

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

C++: #include<bits/stdc++.h>
#include<vector>
#include<list>
#include<stack>
#include<queue>
#include<algorithm>
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)!=EOF){
        double x=(c*e-b*f)/(a*e-b*d);
        double y=(c-a*x)/b;

        if(abs(x)<1e-10){
            x=0;
        }
        if(abs(y)<1e-10){
            y=0;
        }
        printf("%.3f %.3f\n",x,y);
    }
    return 0;
}

C++: #include <iostream>

int main(int argc, char **argv) {
	double a, b, c, d, e, f, x, y;
	
	while(std::cin >> a >> b >> c >> d >> e >> f) {
		y = (c * d - a * f) / (b * d - a * e);
		x = (c - b * y) / a;
		std::cout << x << " " << y << std::endl;
	}
}

C++: #include<iostream>

using namespace std;

int main()
{
	double ax,by,c,dx,ey,f,x1,x2,x,y;
	
	for(;cin >> ax >> by >> c >> dx >> ey >> f;)
	{
		
		x1=by/ax;
		x2=c/ax;
		y=(f-dx*x2)/(ey-dx*x1);
		x=x2-x1*y;
		
		printf("%.3f %.3f\n",x,y);
	}
}

C++: #include<iostream>
#include<algorithm>
#include<vector>
#include<stack>
#include<queue>
#include<cstdio>
#include<climits>
#include<cmath>
#include<cstring>
#include<string>

#define f first
#define s second
#define mp make_pair

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,c) for(__typeof((c).begin()) i=(c).begin(); i!=(c).end(); i++)
#define ALL(c) (c).begin(), (c).end()
#define EPS (1e-10)
using namespace std;

typedef unsigned int uint;
typedef long long ll;

int main(){
  double a,b,c,d,e,f;
  while(cin>>a>>b>>c>>d>>e>>f){
    double x = (e*c-b*f)/(a*e-b*d);
    double y = (-d*c+a*f)/(a*e-b*d);
    printf("%.3f %.3f\n",x+EPS,y+EPS);
  }
  return 0;
}

C++: #include<stdio.h>
//#include<cmath>
int main(void)
{
	//入力用変数
	double nyuuryoku1 = 0, nyuuryoku2 = 0,nyuuryoku3 = 0,nyuuryoku4 = 0;
	//連立方程式の答えの変数(解ではない)
	double ans1 = 0,ans2 = 0;
	//ans1とans2を消さないために
	double ans1_hozon = 0,ans2_hozon;
	//解
	double x = 0,y = 0;
	//保存用変数
	double hozon1 = 0,hozon2 = 0;

	while (scanf("%lf %lf %lf %lf %lf %lf",&nyuuryoku1,&nyuuryoku2,&ans1,&nyuuryoku3,&nyuuryoku4,&ans2) != EOF)
	{
		//まず答えの値をＸのためにかけた値分ｎ倍する
		ans1_hozon = ans1 * nyuuryoku3;
		ans2_hozon = ans2 * nyuuryoku1;
		//yも同じ数分かける(紙に書けば理解できるはず・・・)
		hozon1 = nyuuryoku2 * nyuuryoku3;
		hozon2 = nyuuryoku4 * nyuuryoku1;
		//xは同じ数なので無視して、答えとｙを引き算し、最終的にはｙを求める
		y = (ans1_hozon - ans2_hozon) / (hozon1 - hozon2);

		//xを求めたyを悪用して簡単にやってしまう
		x = (ans1 - (nyuuryoku2 * y)) / nyuuryoku1;

		//表示
		printf("%.3lf %.3lf\n",x,y);
	}

	return 0;
}

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

int main(){
  int a,b,c,d,e,f;
  while(cin >> a >> b >> c >> d >> e >> f){
    double x,y;
    if(0 != a * e - d * b){
      x = 1.0 * (e * c - b * f)  / (a * e - b * d);
      y = 1.0 * (a * f - d * c)  / (a * e - b * d);
    }else{
      x = 0;
      y = 0;
    }
    double x_ = round(x * 1000)/1000;
    double y_ = round(y * 1000)/1000;
    cout << fixed << setprecision(3) << x_ << " ";
    cout << fixed << setprecision(3) << y_ << endl;
  }
  return 0;
}

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

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

    while(cin >> a >> b >> c >> d >> e >> f)
    {
        det = (double) (a*e-b*d);
        det = 1.0 /det;
        x = ((double)(c * e - b * f))  * det;
        y = ((double)(a * f - c * d)) * det;
        printf("%.3lf %.3lf\n", x, y);
    }
    return 0;
}

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

int main()
{
    double a, b, c, d, e, f, x, y;
    while (std::cin >> a >> b >> c >> d >> e >> f) {
        x = (c * e - b * f) / (a * e - b * d);
        y = (-c * d + a * f) / (a * e - b * d);
        if (x == 0.0) {
            x *= -1;
        }
        if (y == 0.0) {
            y *= -1;
        }
        std::cout << std::fixed << std::setprecision(3) << x << " " << y << std::endl;
    }
    return 0;
}

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

/*
 * Wrong Answer
 * 2015-06-26 02:00
 */

int main(void)
{
	int 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 - b * d );
		x = ( c - b * y ) / a;
		printf("%.3f %.3f\n", x, y );
	}

	return 0;
}