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

		
			fmt.Printf("%d.000 ", x)
			fmt.Printf("%d.000\n", y)
	}
}

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

int main(){
  int i;
  float x[6];
  int y1, y2, re1, re2;

  while(cin >> x[0]){
    for(i=1; i<6; i++){
      cin >> x[i];
    }

    //normalize
    x[1]/=x[0]; x[2]/=x[0]; x[0]=1;

    //subtraction
    x[4]-=x[3]*x[1]; x[5]-=x[3]*x[2]; x[3]=0;

    //normalize
    x[5]/=x[4]; x[4]=1;

    //subtraction
    x[2]-=x[1]*x[5]; x[1]=0;

    y1=(int)x[2]*10000; y2=(int)x[5]*10000;
    re1=y1%10; re2=y2%10;
    if(re1>4) y1-=re1;
    else y1+=10-re1;
    if(re2>4) y2-=re2;
    else y2+=10-re2;
    printf("%f %f\n", (float)y1/10000.0f, (float)y2/10000.0f);
  }

  return 0;
}

C++: #include <iostream>
#include <cmath>
#include <algorithm>
#include <string>
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);
       
        y=(a*f-c*d)/(a*e-b*d);
        printf("%.3f %.3f\n",x,y);
    }
}

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;
                p = b * d - e * a;
                q = c * d - f * a;
                y = q / p;
                std::cout << std::fixed << std::setprecision(3) << x << " " << y << std::endl;
        }
        return 0;
}

C++: #include<bits/stdc++.h>
using namespace std;

const double EPS=1e-12;
typedef vector<double>vec;
typedef vector<vec>mat;

/// Ax=b
vec gauss_jordan(const mat& A,const vec& b){
    int n=A.size();
    mat B(n,vec(n+1));

    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++)B[i][j]=A[i][j];

    for(int i=0;i<n;i++)B[i][n]=b[i];

    for(int i=0;i<n;i++){
        int pivot=i;
        for(int j=i+1;j<n;j++){
            if(abs(B[j][i])<abs(B[pivot][i]))pivot=j;
        }
        swap(B[i],B[pivot]);
        if(abs(B[i][i])<EPS)return vec();

        for(int j=i+1;j<=n;j++)B[i][j]/=B[i][i];
        for(int j=0;j<n;j++){
            if(i==j)continue;
            for(int k=i+1;k<=n;k++)B[j][k]-=B[j][i]*B[i][k];
        }
    }

    vec x(n);
    for(int i=0;i<n;i++)x[i]=B[i][n];
    return x;
}

int main(){
    mat A(2,vec(2));
    vec b(2);
    while(true){
        for(int i=0;i<2;i++){
            if(scanf("%lf%lf%lf",&A[i][0],&A[i][1],&b[i])==EOF)return 0;
        }

        vec x=gauss_jordan(A,b);
        if(x.size()<2)return 0;
        printf("%lf %lf\n",x[0],x[1]);
    }
    return 0;
}

C++: #include<stdio.h>

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

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

int main(){
	double a11=0,a12=0,c=0,a21=0,a22=0,f=0;
	while(cin>>a11){
		cin>>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);}
		printf("%.4lf %.4lf\n",x,y);
	}
	return 0;
}

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

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 = ((a*f)-(c*d))/((a*e)-(b*d));
        if(x==-0)
        {
            x=0;
        }
        if(y==-0)
        {
            y=0;
        }

        cout << fixed << setprecision(3) << x << " " << y;

    }
}

C++: //Simultaneous Equation

#include <iostream>
#include <cstdio>
#include <cassert>
#include <cmath>
#include <cfloat>

namespace {

inline bool is_nearly_zero(double x)
{
  if (std::abs(x) < DBL_EPSILON)
    return true;
  else
    return false;
}

}

int main()
{
  while (1) {
    double x, y;
    double a, b, c, d, e, f;
    std::cin >> a >> b >> c >> d >> e >> f;
    if (std::cin.fail()) break;

    const double det = (a * e) - (b * d);
    assert(!is_nearly_zero(det));

    const double inv_mat[2][2] = {
    	{e, -b},
    	{-d, a}
    };

    x = ((inv_mat[0][0] * c) + (inv_mat[0][1] * f)) / det;
    y = ((inv_mat[1][0] * c) + (inv_mat[1][1] * f)) / det;

	if (is_nearly_zero(x)) x = 0.0;
	if (is_nearly_zero(y)) y = 0.0;
	
    printf("%.3f %.3f\n", x, y);
  }

  return 0;
}

C++: #include<iostream>
#include <iomanip>
using namespace std;
int main()
{
	int a,b,c,d,e,f;
	double x,y;
	while(cin>>a>>b>>c>>d>>e>>f,!cin.eof())
	{
		y = b/e;
		x = (y*f-c)/(y*d-a);
		y = (c-a*x)/b;
		cout.setf(ios::fixed);
		cout.precision(3); ;
		cout<<x<<" "<<y<<endl;
	}
	return 0;
}

C++: #include<iostream>
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 - f*b / e) / (a - d*b/e);
    y = (c - f*a / d) / (b - e*a/d);

    cout << x << " " << y << endl;
   }

  return 0;
}

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

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

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

	return 0;

}

C++: #include<cstdio>
#include<iostream>
using namespace std;
int main(){
        double a1,a2,b1,b2,c1,c2,x,y;
        while(scanf("%lf%lf%lf%lf%lf%lf",&a1,&b1,&c1,&a2,&b2,&c2)!=EOF){
                x=(b2*c1-c2*b1)/(a1*b2-a2*b1);
                y=(a1*c2-a2*c1)/(a1*b2-a2*b1);
                if(x==-0)x=0;
                if(y==-0)y=0;
                printf("%.3lf %.3lf\n",x,y);
        }
        return 0;
}

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

using namespace std;

int main(){

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

while(cin >> a >> b >> c >> d >> e >> f){

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

cout << setprecision(4) << x << " " << y;
}
}

C++: #include <cstdio>

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

    while (scanf("%d %d %d %d %d %d", &a, &b, &c, &d, &e, &f) != EOF) {
        x = (double)(e * c - b * f) / (a * e - b * d);
        y = (double)(a * f - d * c) / (a * e - b * d);

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

    return 0;
}