Go: package main

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

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	var strs []string
	var a, b, c, d, e, f float64
	var x, y float64
	for scanner.Scan() {
		strs = strings.Split(scanner.Text(), " ")
		_a, _ := strconv.Atoi(strs[0])
		_b, _ := strconv.Atoi(strs[1])
		_c, _ := strconv.Atoi(strs[2])
		_d, _ := strconv.Atoi(strs[3])
		_e, _ := strconv.Atoi(strs[4])
		_f, _ := strconv.Atoi(strs[5])
		a = float64(_a)
		b = float64(_b)
		c = float64(_c)
		d = float64(_d)
		e = float64(_e)
		f = float64(_f)
		y = (c*d - f*a) / (d*b - a*e)
		x = (c - b*y) / a

		fmt.Printf("%.3f %.3f\n", x, y)
	}
}

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

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

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

	return 0;

}

C++: #include <iostream>

using namespace std;

int main(){
    double a,b,c,d,e,f,x,y;
    
    cin >> a >> b >> c >> d >> e >> f ;
    
    x=(c*e-b*f)/(a*e-d*b);
    y=(c*d-f*a)/(b*d-e*a);
    
    cout << x << " " << y << flush;
}

C++: #include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
int main(){
 double a,b,c,d,e,f;
 while(cin>>a>>b>>c>>d>>e>>f){
  double x = (c*e-f*b)/(a*e-b*d);
  double y = (a*f-d*c)/(a*e-d*b);
  if(x == 0) x = 0.0;
  if(y == 0) y = 0.0;
  printf("%.3lf %.3lf\n",x,y);
 }
 return 0;
}

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

using namespace std;

int main()
{
 double a,b,c,d,e,f;
 double n;
 double x,y,ty,tc;
	while( cin>>a>>b>>c>>d>>e>>f )
	{
 	n=(a/d);
 	d = d * n;
 	e = e * n;
 	f = f * n;

	ty = b-e; 	
 	tc = c-f;
 	y = tc/ty;

 	tc = c - (b*y);
 	x = tc/a;
 	
 	cout << setiosflags(ios::fixed);
	cout << setprecision(3);
 	cout << x <<" "<< y <<endl;
 	
	}
 
}

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

using namespace std;

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

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

C++: #include<stdio.h>
int main(){
	double a,b,c,d,e,f,x,y;
	while(scanf("%lf%lf%lf%lf%lf%lf",&a,&b,&c,&d,&e,&f)!=-1){
		x=((c*e-f*b)/(a*e-d*b));
		y=((c-a*x)/b);
		printf("%.3lf %.3lf\n",x,y);
	}
	return 0;
}

C++: #include <iostream>
#include <cstdio>
using namespace std;
int main()
{
  double a,b,c,d,e,f,x,y;
  while(cin >> a){
    cin >> b >> c >> d >> e >> f;
    if(b == 0){
      x = c / a;
    }else if(e == 0){
      x = f / d;
    }else if(b != 0 && e != 0){
      double g = a / b;
      double h = d / e;
      double i = c / b;
      double j = f / e;
      x = (i - j) / (g - h);
    }else{
      return -1;
    }
    if(b != 0){
      y = (c - a * x) / b;
    }else{
      y = (f - d * x) / e;
    }
    printf("%.3f %.3f\n", x, y);
  }
  return 0;
}

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

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

C++: #include<iostream>
int gcd(int x,int y){
	if(y==0)return x;
	else return gcd(y,x%y);
}
int main(){
	while(1){
		int a,b,c,d,e,f;
		std::cin>>a>>b>>c>>d>>e>>f;
		int b2=b*gcd(a,d)/a;
		int e2=e*gcd(a,d)/d;
		int c2=c*gcd(a,d)/a;
		int f2=f*gcd(a,d)/d;
		int y=(f2-c2)/(e2-b2);
		int x=(e-b*y)/a;
		std::cout<<x<<" "<<y<<std::endl;

		break;
	}
	return 0;
}

C++: #include <iostream>
#include <vector>
#include <map>

typedef pair<int,int> mat;
using namespace std;
int main()
{
int a,b,c,d,e,f;
double A[2][2];
double B[2];
double inv_A[2][2];
scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f);
int det = a*e-b*d;
A[0][0]=a; A[0][1] = b;
A[1][0]=d; A[1][1] = e;
B[0] = c;
B[1] = f; 

inv_A[0][0]=1.0/(double)det *A[1][1]; inv_A[0][1]=1.0/(double)det *-A[1][1];
inv_A[1][0]=1.0/(double)det *-A[1][0]; inv_A[1][1]=1.0/(double)det *A[0][0];

double res[2];
res[0]=0;
res[1]=0;

for(int i=0;i<2;i++){
for(int j=0;j<2;j++){
for(int k=0;k<2;k++){
res[i]+=inv_A[j][k]*B[k];
}
}
}

printf("%.3f %.3f\n",res[0],res[1]);
}

C++: #include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
double gcd( double m, double n );
double lcm( double m, double n );
int main(int argc, const char * argv[])
{
    double a=0.0;
    double b=0.0;
    double c=0.0;
    double d=0.0;
    double e=0.0;
    double f=0.0;
    double x=0.0;
    double y=0.0;
    int end=0;
    
    while(scanf("%d",&end)!=EOF){
        a=end;
        scanf("%lf",&b);
        scanf("%lf",&c);
        scanf("%lf",&d);
        scanf("%lf",&e);
        scanf("%lf",&f);
        double ad = lcm( a,d );
        
        double a2 = ad/a;
        double b2 = b*a2;
        double c2 = c*a2;
        
        double d2 = ad/d;
        double e2 = e*d2;
        double f2 = f*d2;
        
        y = (c2-f2)/(b2-e2);
        x = (c-b*y)/a;
        
        printf("%.3lf",x);
        printf(" ");
        printf("%.3lf\n",y);
        
    }
    
}
double gcd( double m, double n )
{
	if ( ( 0.0 == m ) || ( 0.0 == n ) )
		return 0;
	while( m != n )
	{
		if ( m > n ) m = m - n;
		else         n = n - m;
	}
	return m;
}

double lcm( double m, double n )
{
	if ( ( 0.0 == m ) || ( 0.0 == n ) )
		return 0;
	
	return ((m / gcd(m, n)) * n);
}

C++: #include <iostream>
#include <iomanip>
using namespace std;
int main() {
int a,b,c,d,e,f;
while (cin>>a>>b>>c>>d>>e>>f) {
 double dx = c*e-b*f;
 double dy = a*f-c*d;
 double d  = a*e-b*d;
 cout << fixed << setprecision(4) << dx/d << ' ' << dy/d << endl;
 }
return 0;
}

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

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

	while(1){
		getline( cin, str );
		if( str.size()==0 ){
			break;
		}
		sscanf( str.c_str(), "%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f );

		double D  = a*e-b*d;
		double D1 = c*e-f*b;
		double D2 = a*f-d*c;
		cout << D << " " << D1 << " " << D2 << endl;
		x = D1 / D;
		y = D2 / D;

		bool isX = ( (c-a*x)/b == (f-d*x)/e );
		bool isY = ( (c-b*y)/a == (f-e*y)/d );
		cout << isX << " " << isY << endl;
		if( !isX && isY ){
			x = 0.0;
			y = c/b;
		}else if( isX && !isY ){
			y = 0.0;
			x = c/a;
		}else if( !isX && !isY ){
			x = y = 0.0;
		}

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

	return 0;
}

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

// ax + by = c
// dx + ey = f
// det(A) = ae-bd
// A^(-1) = 1/det(A)* ((e,-b),(-d,a))
// x = 1/det(A) *(ce-bf)
// y =			*(-cd+af)

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

C++: #include<bits/stdc++.h>
using namespace std;
int main()
{
    double a,b,c,d,e,f,g,h;
    while(cin>>a>>b>>c>>d>>e>>f){
            h=0;g=0;
    h=(d*c-a*f)/(b*d-a*e);
    g=(c-b*h)/a;
    printf("%.3lf %.3lf\n",g,h);
    }
    return 0;

}