Go: package main

import "fmt"

func main() {
	var Xs, Ys []float32
	Xs = make([]float32, 0)
	Ys = make([]float32, 0)
	var cnt int
	for {
		var a, b, c, d, e, f, x, y float32
		fmt.Scanf("%f %f %f %f %f %f", &a, &b, &c, &d, &e, &f)
		if a == 0 {
			break
		}
		y = (((a * f) - (d * c)) / ((a * e) - (b * d)))
		x = ((c - (b * y)) / a)
		Xs = append(Xs, x)
		Ys = append(Ys, y)
		cnt++
	}
	for i := 0; i < cnt; i++ {
		fmt.Printf("%.3f %.3f\n", Xs[i], Ys[i])
	}
}

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    vector<double> a, b, c, d, e, f;
    int i = 0;
    while(cin) {
        double ai, bi, ci, di, ei, fi;
        cin >> ai >> bi >> ci >> di >> ei >> fi;
        a.push_back(ai);
        b.push_back(bi);
        c.push_back(ci);
        d.push_back(di);
        e.push_back(ei);
        f.push_back(fi);
        i++;
    }
    
    for(int j=0; j+1<i; j++) {
        double ai = a[j];
        double bi = b[j];
        double ci = c[j];
        double di = d[j];
        double ei = e[j];
        double fi = f[j];
        
        double x = (bi * fi / ei - ci) / ( bi * di / ei - ai);
        double y = (ci - ai * x) / bi;
        if(x == -0) x = 0;
        if(y == -0) y = 0;
        cout << fixed << setprecision(3) << x << " " << y << endl;
    }
    return 0;
}

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

int main(){
	double a11,a12,c,a21,a22,f;
	while(cin>>a11>>a12>>c>>a21>>a22>>f){
		double x,y,delta=((double)a11*a22-(double)a12*a21);
		x=((double)a22*c-(double)a12*f)/delta;
		y=((double)a11*f-(double)c*a21)/delta;
		if(x>0){x=(double)(((int)((x*1000)+0.5))/1000);
		}else{x=(double)(((int)((x*1000)-0.5))/1000);}
		if(y>0){y=(double)(((int)((y*1000)+0.5))/1000);
		}else{y=(double)(((int)((y*1000)-0.5))/1000);}
		cout<<fixed<<setprecision(3)<<x<<" "<<y<<endl;
	}
	return 0;
}

C++: #include<cstdio>
#include<algorithm>
#include<vector>
#include<string>
#include<iostream>
#include<queue>
#include<map>
#include<set>

using namespace std;

#define reps(i,f,n) for(int i=f;i<int(n);i++)
#define rep(i,n) reps(i,0,n)

int main(){
	double a,b,c,d,e,f;
	while(scanf("%lf%lf%lf%lf%lf%lf",&a,&b,&c,&d,&e,&f)!=EOF){
		
		if(d==0){
			swap(a,d);
			swap(b,e);
			swap(c,f);
		}
		
		double y;
		if(a==0){
			y = b/c;
		}else{
			double A = b/a-e/d;
			double B = c/a-f/d;
			
			y = B/A;
		}
		double x = f/d-e/d*y;
		
		if(x==fabs(x))x=fabs(x);
		if(y==fabs(y))y=fabs(y);
		
		printf("%.3lf %.3lf\n",x,y);
	}
}

C++: /*
　　　　 ∧＿∧　にっぽんちゃちゃちゃ
　／＼（　・∀・）／ヽ
（ ●　と　　　つ　● ）　にっぽんちゃちゃちゃ
　＼/⊂、 ノ　　＼ノ
　　　　　し'
*/
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define repone(i,n) for(int i=1;i<(int)(n);++i)
#define repo(i,o,n) for(int i=o;i<(int)(n);++i)
#define Rep(j,n) for(int j=0;j<(int)(n);++j)
#define Repone(j,n) for(int j=1;j<(int)(n);++j)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define int long long
#define MOD 1000000007
#define INF 9223372036854775807

signed main()
{
  string xyz ="";
int x=0,y=0,z=0,w=0,i=0,j=0,n=0;
double a=0,b=0,c=0,d=0,e=0,f=0;
std::vector<int> v;
while(std::cin >>a>>b>>c>>d>>e>>f){
  printf("%0.3f %0.3f\n",(e*c-b*f)/(a*e-b*d)+0,(a*f-d*c)/(a*e-d*b)+0);

}
}

C++: #include <iomanip>
#include <iostream>
#include <vector>
#define N 2
 
using namespace std;
typedef vector< vector<double> > Equation;
 
int main()
{ 
    Equation c(N, vector<double>(N + 1));
	while (cin)
	{
		// input
		for (int i = 0; i < N; ++i)
			for (int j = 0; j < N + 1; ++j)
				cin >> c[i][j];

		// Gaussian elimination
		// 1. Forward elimination
        for (int i = 0; i < N - 1; ++i)
            for (int j = i + 1; j < N; ++j)
            {
                double d = c[j][i] / c[i][i];
                for (int k = i + 1; k <= N; ++k)
                    c[j][k] -= c[i][k] * d;
            }
 
		// 2. Back substitution
        for (int i = N - 1; i >= 0; --i)
        {
            double d = c[i][N];
            for (int j = i + 1; j < N; ++j)
                d -= c[i][j] * c[j][N];
            c[i][N] = d / c[i][i];
        }
 
		for (int i = 0; i < N; ++i)
			if (abs(c[i][N]) == 0.0)
				c[i][N] = 0.0;

        cout << setprecision(3) << fixed << c[0][N];
        for (int i = 1; i < N; ++i)
            cout << " " << c[i][N];
        cout << endl;
    }
 
    return 0;
}

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

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

C++: #include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
using namespace std;
typedef long long ll;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define MOD 1000000007 //10^9+7
#define INF 1000000000 //10^9

double round3(double x);
pair<double, double>equ2(int a,int b,int c,int d,int e,int f);

pair<double, double>equ2(int a,int b,int c,int d,int e,int f){
    double det=1.0/(a*e-b*d);
    double x=(double)(c*e-b*f)*det;
    double y=(double)(a*f-c*d)*det;
    if (x==-0) x=0;if (y==-0) y=0;
    return pair<double, double>(round3(x),round3(y));
}

double round3(double x){
    if(x>=0) return floor((x+0.0005)*1000)/1000.0;
    return -1*floor((-1*x+0.0005)*1000)/1000.0;
}

int main ()
{
    string str;
    while (!cin.fail()) {
        int a,b,c,d,e,f;
        
        cin>>a>>b>>c>>d>>e>>f;
        
        pair<double,double> ans=equ2(a,b,c,d,e,f);
        
        printf("%.3f %.3f\n",ans.first,ans.second);
    }
    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 * (( a * f - c * d ) / ( a * e - b * d ))) / a;
		printf("%.3f %.3f\n", x, y );
	}

	return 0;
}

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

C++: #include <iostream>
using namespace std;
int main(){
	float a,b,c,d,e,f,x,y;
	while(cin>>a>>b>>c>>d>>e>>f){
		y = (d*c - a*f)/(d*b - a*e);
		x = (f - e*y)/d;
	printf("%0.3f %0.3f \n",x,y);
	}
}

C++: 
int main() {
	std::cout << std::setprecision(3);
	std::cout.setf(std::ios::fixed, std::ios::floatfield);
	double a, b, c, d, e, f;
	while( std::cin >> a >> b >> c >> d >> e >> f ) {
		const double x = (b*f-c*e) / (b*d-a*e);
		const double y = (c-a*x) / b;
		std::cout << ((-0.0005<=x && x<0.0005)?0.0:x) << " " << ((-0.0005<=y && y<0.0005)?0.0:y) << std::endl; 
	}
}

C++: #include<stdio.h>

int main(){
	double a,b,c,d,e,f,x,y;
	int status;
	while(1){
		status=scanf("%lf%lf%lf%lf%lf%lf",&a,&b,&c,&d,&e,&f);
		if (status==EOF){
			break;
		}
		x=(f/e-c/b)/(d/e-a/b);
		y=c/b-a*x/b;
		printf("%.3f %.3f\n",x,y);
	}
	
	return 0;
}