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>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cstring>
#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <list>
#include <stack>
#include <queue>
#include <algorithm>
#include <complex>
#include <iterator>
using namespace std;

typedef pair<int, int> pii;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<string> vs;

#define all(c) (c).begin(), (c).end()
#define rall(c) (c).rbegin(), (c).rend()
#define tr(c, i) for(auto i = (c).begin(); i != (c).end(); i++)
#define rtr(c, i) for(auto i = (c).rbegin(); i != (c).rend(); i++)
#define repfn(i, a, cont, next) \
  for(auto i = (a); [=](){return(cont);}(); i = [=](){return(next);}())
#define repby(i, a, b, step) repfn(i, a, i < b, i + step)
#define repab(i, a, b) repby(i, (a), (b), 1)
#define rep(i, n) repab(i, 0, (n))
#define pb push_back
#define sz(c) int((c).size())

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

C++: #include<stdio.h>
int main(void)
{
    double a,b,c,d,e,f,x,y;

		scanf("%lf %lf %lf %lf %lf %lf",&a,&b,&c,&d,&e,&f);
		
        y=(c*d-f*a)/(b*d-a*e);
		x=(c-b*y)/a;
		
		printf("%0.3lf %0.3lf\n",x,y);
	
	return 0;
}

C++: #include<iostream>
using namespace std;
int main() {
	double a, b, c, d, e, f, x, y;
	while (!cin.eof()) {
		cin >> a >> b >> c >> d >> e >> f;
		double bd = b*d;
		double ea = e*a;
		double cd = c*d;
		double fa = f*a;
		y = (cd - fa) / (bd - ea);
		x = (c - b*y) / a;
		printf("%3f %3f\n", x, y);
	}
}

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



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

C++: 
#include <stdio.h>

int main(){
    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) {
        x=(double)((c*e-b*f)/(a*e-b*d));
        y=(double)((c*d-a*f)/(b*d-a*e));
        if(-0.0005<x && x<=0)
            x=0;
        if(-0.0005<y && y<=0)
            y=0;
        printf("%.3f %.3f\n",x,y);
    }
    
    return 0;
}

C++: #include <cstdio>
int main (int argc, char *argv[]) {
    using namespace std;
    int a, b, c, d, e, f;
    while (EOF != fscanf(stdin, "%d %d %d %d %d %d\n", &a, &b, &c, &d, &e, &f)) {
        float tmp1 = static_cast<float>(f)-(static_cast<float>(c)*static_cast<float>(d)/static_cast<float>(a));
        float tmp2 = static_cast<float>(e)-(static_cast<float>(b)*static_cast<float>(d)/static_cast<float>(a));
        float y = tmp1/tmp2;
        float x = (static_cast<float>(c) - static_cast<float>(b) * y) / static_cast<float>(a);
        printf("%.3f %.3f\n", x, y);        
        //printf("y=%f\n", (f-(c*d/a))/(e-(b*d/a)));
    }
    return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <stdlib.h>
using namespace std;
int main(){
	int a,b,c,d,e,f;
	while(cin >> a >> b >> c >> d >> e >> f){
		double x = double(c*e-f*b)/double(a*e-d*b);
		double y = double(c*d-f*a)/double(b*d-a*e);
		if(abs(x)<0.0001) x = 0.0;
		if(abs(y)<0.0001) y = 0.0;
		cout << fixed << setprecision(3) << x << " " << y << endl;
	}
}

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

using namespace std;

int main(){
	
	double a[6];

	for(int i=0; i<6; i++){
		cin >> a[i];
	}

	double x,y;

	y=(a[2]/a[0]-a[5]/a[3])/(a[1]/a[0]-a[4]/a[3]);

	x = a[2]/a[0] - a[1]/a[0] * y;

	
	double diff = 0.5;

	x<0?(diff=-0.5):(diff=0.5);
	x = (int)(x*1000+diff);
	
	y<0?(diff=-0.5):(diff=0.5); 
	y = (int)(y*1000+diff); 
	

	x /= 1000;y/=1000;
	

	printf("%.3f %.3f\n", x, y);	
	
		
	return 0;
}

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

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

C++: #include <cstdio>
#include <stdlib.h>
#include <math.h>

float a,b,c,d,e,f;
double    round( double val, int precision )
{
    double    ret;
    char    buf[256] = {'\0'};
    char    *p;

    sprintf( buf, "%.*f", precision, val );
    ret = strtod( buf, &p );

    return ret;
}
int main (){
  scanf("%f %f %f %f %f %f",&a,&b,&c,&d,&e,&f);
  double x,y;
  x=(f*b/e-c)/(d*b/e-a);
  y=(f*a/d-c)/(e*a/d-b);
 round(x,4);
 round(y,4);
modf(x*1000, &x);
modf(y*1000, &y);
  printf("%.3f %.3f\n",x/1000,y/1000);
}

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

int rnd(double t){
	if(t>=0.0){
		return (int)(t+0.5);
	}else{
		return (int)(t-0.5);
	}
}
void prnt(double t){
	if(t<0.0){
		cout<<"-";
		t*=-1;
	}
	cout<<(int)t<<"."<<(int)(t*10)-(int)t*10<<(int)(t*100)-(int)(t*10)*10<<(int)(t*1000)-(int)(t*100)*10;
}
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=rnd(x*1000.0)/1000.0;
		y=rnd(y*1000.0)/1000.0;
		prnt(x);
		cout<<" ";
		prnt(y);
		cout<<endl;
	}
	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <numeric>
#include <string>
#include <vector>
#include <list>

#define DIM 2

typedef std::vector<double> Vec;
typedef std::vector<Vec> Mat;
typedef std::pair<Mat,Vec> Eq;

int main(void){
	using namespace std;

	list<Eq> input;

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

	cout << fixed << setprecision(3);

	while(cin >> a >> b >> c >> d >> e >> f){
		Vec m1, m2;
		m1.push_back(a);
		m1.push_back(b);
		m2.push_back(d);
		m2.push_back(e);

		Vec vec;
		vec.push_back(c);
		vec.push_back(f);

		Mat mat;
		mat.push_back(m1);
		mat.push_back(m2);

		Eq eq = make_pair(mat,vec);

		input.push_back(eq);
	}

	for(auto itr = input.begin(); itr!=input.end(); ++itr){
		auto mat = itr->first;
		auto vec = itr->second;

		Vec output(DIM);

		auto det = mat[0][0] * mat[1][1] - mat[0][1] * mat[1][0];
		std::transform(vec.begin(), vec.end(),vec.begin(), std::bind1st(multiplies<double>(),1.0/det));

		mat[0][1] = -mat[0][1];
		mat[1][0] = -mat[1][0];
		swap(mat[0][0],mat[1][1]);

		for (int i=0; i<DIM; i++){
			output[i] = inner_product(vec.begin(), vec.end(), mat[i].begin(), 0);
		}

		cout << output[0] << " " << output[1] << endl;
	}

}

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

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

	while (scanf("%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f) != EOF){
		double y = (d * c - a * f) / (d * b - a * e);
		double x = (f - e * y) / d;
		if (fabs(x) < 1e-4) x = 0.0;
		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,y,x;
	
	while(cin>>a>>b>>c>>d>>e>>f){
	
	
	y = (double)((e*c-b*f)/(a*e-b*d));
	
	x = (double)((-(d*c)+a*f)/(a*e-b*d));
	
	if(x == 0)
		x = 0;
	if(y == 0)
		y =0;
	
	printf("%.3f %.3f\n",x,y);
	}
}