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++: /*
C++ ???????????????????????????????????¬??????
??????AOJ-ITP1??????????????????
*/

#define _USE_MATH_DEFINES

#include <iostream> // ?¨??????\??????
#include <fstream>  // ??????????????\??????
#include <string>   // ???????????¢???
#include <vector>   // ???????????????
#include <cmath>    // ??°??????
#include <iomanip>  // stream???????????¢???
#include <algorithm>// max??¢??°??????

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;        // ????´???°????????????????????????
using std::fixed;         // ???????????????????¨???????????????????????????????
using std::setprecision;  // ?????°????°???°?????\???????????°????????????????????¨????????\???

int main() {
	double a, b, p, c, d, q;
	double x, y;

	while (cin >> a >> b >> p >> c >> d >> q)
	{
		x = (p*d - b*q) / (a*d - b*c);
		y = (a*q - p*c) / (a*d - b*c);
		
		cout << fixed << setprecision(3) << x << " " << y << endl;
	}
	return 0;
}

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

int main(){
  int i;
  float x[6];

  while(cin >> x[0]){
    for(i=1; i<6; i++){
      cin >> x[i];
    }

    //normalize
    x[1]/=x[0]; x[2]/=x[1]; x[0]=1;

    //subtraction
    x[4]-=x[3]*x[1]; x[5]-=x[3]*x[2]; x[3]=0;

    //normalize
    x[5]/=x[4]; x[4]=1;

    //subtraction
    x[2]-=x[1]*x[5]; x[1]=0;

    printf("%f %f\n", x[2], x[5]);
  }

  return 0;
}

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

using namespace std;

int main(){
	cout << setprecision(3) << setiosflags(ios::fixed);
	double x[2];
	double y[2];
	for(int h = 0; h < 2; ++h){
		double a, b, c, d, e, f;
		cin >> a >> b >> c >> d >> e >> f;
		x[h] = (c*e-f*b)/(a*e-d*b);
		y[h] = (c*d-f*a)/(b*d-a*e);
	
		}
	
	cout << x[0] << " " << y[0] << '\n';
	cout << x[1] << " " << y[1] << '\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)
	{
               
               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);


               if(x == -0.0){ x = 0.0;}
               if(y == -0.0){ y = 0.0; }
	       
               cout<<setprecision(3)<<fixed;
	       cout<<x<<" "<<y<<endl;
	}
	return 0;
}

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

int main(){
  double a,b,c,d,e,f;
  while(cin >> a >> b >> c >> d >> e >> f){
    double x = (e*c - b*f)/(e*a - b*d) + 1e-10;
    double y = (d*c - a*f)/(d*b - a*e) + 1e-10;
    cout << fixed << setprecision(3) << x << " " << y << endl;
  }
}

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>
#include<iomanip>

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

C++: #include <cmath>
#include <cstdlib>
#include <cstdio>

#include <iostream>
#include <vector>
#include <algorithm>

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

    x = (double)(long)(x*1000);
    y = (double)(long)(y*1000);

    x /= 1000;
    y /= 1000;    

    printf("%.03lf %.03lf\n", x, y); 
  }

  return 0;
}

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

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

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

using namespace std;

double A[2][2];
double B[2];
double Ainv[2][2];

int main()
{
	while(scanf("%lf %lf %lf %lf %lf %lf", &A[0][0], &A[0][1], &B[0],
				&A[1][0], &A[1][1], &B[1]) != EOF)
	{
		double det = A[0][0] * A[1][1] - A[1][0] * A[0][1];
		if(det == 0.0)
		{
			cout << "this equation has no answer." << endl;
			return -1;
		}

		Ainv[0][0] = A[1][1] / det;
		Ainv[0][1] = -A[0][1] / det;
		Ainv[1][0] = -A[1][0] / det;
		Ainv[1][1] = A[0][0] / det;
		
		double ans_x = Ainv[0][0] * B[0] + Ainv[0][1] * B[1];
		double ans_y = Ainv[1][0] * B[0] + Ainv[1][1] * B[1];

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

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