Go: package main

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

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		strNums := strings.Fields(scanner.Text())
		nums := []int{}
		for _, strNum := range strNums {
			num, _ := strconv.Atoi(strNum)
			nums = append(nums, num)
		}
		a := nums[0]
		b := nums[1]
		c := nums[2]
		d := nums[3]
		e := nums[4]
		f := nums[5]
		var mulA, mulD int
		if a < 0 {
			mulA = a * -1
		} else {
			mulA = a
		}
		if d < 0 {
			mulD = d * -1
		} else {
			mulD = d
		}
		a *= mulD
		b *= mulD
		c *= mulD
		d *= mulA
		e *= mulA
		f *= mulA

		if d < 0 {
			d *= -1
			e *= -1
			f *= -1
		}

		bE := b - e
		cF := c - f
		if bE == 0 {
			bE = 1
		}
		y := cF / bE
		x := (c - (y * b)) / a

		fmt.Print(x)
		fmt.Println(".000")
		fmt.Print(y)
		fmt.Println(".000")
	}
}

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

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>(x,y);
}

int main ()
{
    string str;
    while (!cin.eof()) {
        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>
#include <cmath>
#define EPS 0.0000001

using namespace std;

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

  double x, y;

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

C++: /*************************************************************************
	> File Name: 23.cpp
	> Author: ralph
	> Mail: 1694487365@qq.com
	> Created Time: 2018年12月21日 星期五 21时32分48秒
 ************************************************************************/

#include<bits/stdc++.h>
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))
    {
        printf("%.3f %.3f\n",(c*e-b*f)/(a*e-b*d)==0?0.000:(c*e-b*f)/(a*e-b*d),(a*f-c*d)/(a*e-b*d)==0?0.000:(a*f-c*d)/(a*e-b*d));
    }
}

C++: using namespace std;

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

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

		d = d - a;           // d = 0
		e = e - b;
		f = f - c;
	
		f = f * b / e;
		e = e * b / e;


		b = b - e;            // b = 0
		c = c - f;

		c = c / a;            // x = c
		a = a / a;

		f = f / e;            // y = f
		e = e / e;

		cout << fixed << setprecision(3) << c << " " << fixed << setprecision(3) << f << endl;
	}

	return 0;
}

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 "iostream"
#include "cstdio"
using namespace std;

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

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

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

    }
    
    return 0;
}

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

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

	return 0;
}

C++: #include<stdio.h>
int main(void)
{
	int b,a,e,d,f,i,c;
	float y,x;
	while(scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f)!=EOF)  {
			y=(c*d-a*f)/(b*d-a*e);
			x=(c-(b*y))/a;
		if(x<0.0000 && x>-0.0000001){
			x=0.0000;
		}
		if(y<0.000&&y>-0.0000001){
			y=0.0000;
		}	
		printf("%.3f %.3f\n",x,y);
	}
	return 0;
}

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

using namespace std;

int main() {
    double a, b, c, d, e, f, x, y, det;
    while (true) {
        cin >> a >> b >> c >> d >> e >> f;
        if (cin.eof()) {
            return 0;
        }
        det = a*e-b*d;
        x = (c*e-b*f)/det;
        y = (a*f-c*d)/det;
        if (abs(x) < 0.0005) {
            x = 0;
        }
        if (abs(y) < 0.0005) {
            y = 0;
        }
        cout << std::fixed << setprecision(3) << x << ' ' << y << endl;
    }
}

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

int main(){
  double a, b, c, d, e, f;
  cout << fixed;
  cout << setprecision(3);

  while(cin >> a >> b >> c >> d >> e >> f){
    if(c*e == b*f)
      cout << 0.000 << " ";
    else
      cout << (c*e -b*f)/(a*e - b*d) << " ";
    if(c*d == a*f)
      cout << 0.000 << " ";
    else
      cout << (c*d - a*f)/(b*d - a*e) << endl;
  }

  cout << d << " " << e << endl;
  return 0;
}

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

int main(void){
	double x1[1000],y1[1000];
	int a[1000],b[1000],c[1000],d[1000],e[1000],f[1000],i=0,j,r=0,x2[1000],y2[1000];
    
    while(r==0)
	{
		scanf("%d %d %d %d %d %d",&a[i],&b[i],&c[i],&d[i],&e[i],&f[i]);
	    x2[i] = (c[i] * e[i] -b[i] * d[i]) / (a[i] * e[i] - b[i] * d[i])*1000+0.5;
	    y2[i] = (d[i] * c[i] -a[i] * f[i]) / (b[i] * d[i] - a[i] * e[i])*1000+0.5;

		if(a[i] < -1000 || a[i] > 1000  || b[i] < -1000 || b[i] > 1000 ||
		   c[i] < -1000 || c[i] > 1000  || d[i] < -1000 || d[i] > 1000 || 
		   e[i] < -1000  || e[i] > 1000 || f[i] < -1000 || f[i] > 1000)break;
		
		i=i+1;
	}
	for(j=0;j<i;j++)
	{
		x1[j]=x2[j]/1000;
		y1[j]=y2[j]/1000;
		printf("%f %f\n",x1[j],y1[j]);
	}
  return 0;
}

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

int main()
{
    int a,b,c,d,e,f;
    double x,y;
    for(int i=0;i<2;i++){
        cin>>a>>b>>c>>d>>e>>f
        double l,m,n;
        l=a/d;
        m=b-e*l;
        n=c-f*l;
        y=n/m;
        x=(c-b*y)/a;
        cout<<x<<" "<<y<<endl;
    }
    return 0;
}

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