Go: package main

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

func gcd(num1, num2 int) int {
	if num2 == 0 {
		return num1
	}
	num3 := num1 % num2
	return gcd(num2, num3)
}

func lcm(num1, num2 int) int {
	if num1%num2 != 0 {
		num3 := gcd(num1, num2)
		for i := 1; ; i++ {
			check := num3 * i
			if check%num1 == 0 && check%num2 == 0 {
				return check
			}
		}
	} else {
		return num1
	}
}

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]
		lcm := lcm(a, d)
		mulA := lcm / a
		mulD := lcm / d
		a *= mulA
		b *= mulA
		c *= mulA
		d *= mulD
		e *= mulD
		f *= mulD

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

		bE := b - e
		cF := c - f
		y := float64(cF) / float64(bE)
		x := (float64(c) - (y * float64(b))) / float64(a)

		if x == 0 {
			fmt.Printf("%.3f ", 0.0)
		} else {
			fmt.Printf("%.3f ", x)
		}
		if y == 0 {
			fmt.Printf("%.3f\n", 0.0)
		} else {
			fmt.Printf("%.3f\n", y)
		}
	}
}

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

/*
ax + by = c
dx + ey = f

x = (c-by)/a
d(c-by)/a + ey = f
dc/a - dby/a + ey = f
ey - dby/a = f - dc/a
y(e-db/a) = f - dc/a
y = (f-dc/a)/(e-db/a)

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

C++: #include <stdio.h>
#include <math.h>
int main(void){
    float a,b,c,d,s,t;
    while(~scanf("%f%f%f%f%f%f",&a,&b,&s,&c,&d,&t)){
        printf("%.3f %.3f\n",floor((s*d-b*t)/(a*d-b*c)*1000+0.5),(a*t-s*c)/(a*d-b*c));
    }
    return 0;
}

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

int main()
{
    int a, b, c, d, e, f;
    while (scanf("%d", &a) != EOF) {
        scanf("%d", &b);
        scanf("%d", &c);
        scanf("%d", &d);
        scanf("%d", &e);
        scanf("%d", &f);
        if (c*e - b*f == 0 && - c*d + a*f == 0) {
            printf("%.3f ", (float) 0);
            printf("%.3f\n", (float) 0); 
        } else if ( - c*d + a*f == 0) {
            printf("%.3f ", (float) (c*e - b*f) / (a*e - b*d ));
            printf("%.3f\n", (float) 0); 
        } else if (c*e -b*f == 0) {
            printf("%.3f ", (float) 0);
            printf("%.3f\n", (float) (- c*d + a*f) / (a*e - b*d ));
        } else {
            printf("%.3f ", (float) (c*e - b*f) / (a*e - b*d ));
            printf("%.3f\n", (float) (- c*d + a*f) / (a*e - b*d ));
        }
    }
    return 0;
}

C++: #include <iostream>

// x = (e * c - b * f) / (a * e - b * d)
// y = (a * f - d * c) / (a * e - b * d)

using namespace std;

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

    while (cin >> a >> b >> c >> d >> e >> f) {
        int det = a * e - b * d;
        double x = (e * c - b * f) / det + 0.0;
        double y = (a * f - d * c) / det + 0.0;
        printf("%.3f %.3f", x, y);
    }

    return 0;
}

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

void solve_SE(double* x, double a, double b, double c, double d, double e, double f)
{
    x[0] = (c * e - f * b) / (a * e - d * b);
    x[1] = (c * d - f * a) / (b * d - e * a);
}

int main()
{
    double a, b, c, d, e, f;
    double x[2];
    while ((cin >> a >> b >> c >> d >> e >> f)) {
        solve_SE(&x[0], a, b, c, d, e, f);
        for (int i = 0; i < 2; i++) {
            x[i] = round(x[i] * 1000) / 1000;
            if (x[i] == 0) x[i] = 0;
        }
        cout << fixed << setprecision(3) << x[0] << ' ' << x[1] << endl;
    }
}

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 round3(double dat){

	int fct;
	fct = (int)pow(10, 3);
	dat *= fct;
	dat = round(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) << round3(x1) << " " << round3(y1) << endl;
	cout << fixed << setprecision(3) << round3(x2) << " " << round3(y2) << endl;

	return 0;
}

C++: #include<algorithm>
#include<functional>
#include<cmath>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<string>
#include<sstream>
#include<iostream>
#include<iomanip>
#include<vector>
#include<list>
#include<stack>
#include<queue>
#include<map>
#include<set>
#include<bitset>

#define all(c) (c).begin(), (c).end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define pb(e) push_back(e)
#define mp(a, b) make_pair(a, b)
#define fr first
#define sc second

typedef unsigned long long ull;
typedef long long ll;

const int INF=100000000;
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

using namespace std;

typedef pair<int ,int > P;

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

int main()
{

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

		double x=(c-b*y)/a;
		/*
		if(x==0.0)
			x=0.0;
		if(y==0.0)
			y=0.0;
			*/
		printf("%.3lf %.3lf\n",x,y);

	}
	


	return 0;
}

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

C++: #include <cstdio>
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)!=EOF) {
        double y = (f+-d*c)/(-b*d+e);
        double x = (c-b*y)/a;
        printf("x = %.3f y = %.3f\n",x,y);
    }
    return 0;
}

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

int main()
{
	for (double a, b, c, d, e, f; cin >> a >> b >> c >> d >> e >> f; cout << fixed << setprecision(4) << (c*e - b*f) / (a*e - b*d) << ' ' << (a*f - c*d) / (a*e - b*d) << endl);
	return 0;
}

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

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

using namespace std;

double round(double d){
	int k = (int)(d*10000)%10;
	int k2 = (int)(d*100000)%10;
	int k3 = (int)(d*1000000)%10;
	int k4 = (int)(d*10000000)%10;
	return (k>=5 || k == 4 && k2 == 9 && k3 == 9 && k4 == 9)? d-((double)k/10000)+0.001: d- ((double)k/10000);
}

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

	while(cin >> a >> b >> c >> d >> e >> f){
		double del = 1.0/(a*e - d*b);
		printf("%0.3f %0.3f\n", round(del*(e*c-b*f)), round(del*(a*f-d*c)));
	}
}

C++: const int tt = 10000;

#include<iostream>
#include<string>
#include<sstream>
using namespace std;

string toStr(int n);
string intToString(int n);

int main() {
  int a, b, c, d, e, f;
  
  while(cin >> a >> b >> c >> d >> e >> f) {
    c = c * tt;
    f = f * tt;

    int det = a * e - b * d;

    int x = ( e * c - b * f) / det;
    int y = (-d * c + a * f) / det;
//    cout << x << y << endl;

    cout << toStr(x) << " " << toStr(y) << endl;
  }
}

string toStr(int n) {
  string pm, val;
  
  if (n < 0) {
    pm = "-";
    n = -n;
  } else {
    pm = "";
  }

  int ipart = n / tt;
  int fpart = (n - ipart * tt) + tt + 5;

  val = pm + intToString(ipart) + "." + intToString(fpart).substr(1, 3);
  return val;
}

string intToString(int n) {
  stringstream ss;
  ss << n;
  return ss.str();
}