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

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

int main(){
	int T;
	double a,b,c,d,e,f;
	while(cin >> a >> b >> c >> d >> e >> f){
		double D = a*e-b*d;
		double x = c*e-b*f;
		double y = a*f-c*d;
		x /= D;
		y /= D;
		x += 1e-9;
		y += 1e-9;
		printf("%.4lf %.4lf\n",x,y);
	}
}

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

int main() {
        int a, b, c, d, e, f;
        double x, y;
        char line[200];

        while(fgets(line, 200, stdin) != NULL) {
                sscanf(line, "%d%d%d%d%d%d", &a, &b, &c, &d, &e, &f);
                x = ((double)(e*c - b*f)) / (a*e - d*b);
                y = ((double)(a*f - d*c)) / (a*e - d*b);
                if(abs(x) < 1.0e-4) x = 0;
                if(abs(y) < 1.0e-4) y = 0;
                printf("%.3f %.3f\n", x, y);
        }
}

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

int main(){
	double A[2][2];
	double B[2][1];
	double x,y;
	while(cin >> A[0][0] >> A[0][1] >> B[0][0] >> A[1][0] >> A[1][1] >> B[1][0]){
		A[0][1] /= A[0][0];
		B[0][0] /= A[0][0];
		A[1][1] -= A[1][0]*A[0][1];
		B[1][0] -= A[1][0]*B[0][0];
		B[1][0] /= A[1][1];
		B[0][0] -= A[0][1]*B[1][0];
		cout << fixed<< setprecision(3) << B[0][0] << " " << setprecision(3) << B[1][0] << endl;
	}
	return 0;
}

C++: #include <iostream>

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

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

    return 0;
}

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

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 = (f-d*x)/e;
		printf("%.3f %.3f\n", x, y);
	}
	return 0;
}

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

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

  while( cin >> a >> b >> c >> d >> e >> f ) {
    det = a*e-b*d;
    float x = (c*e-f*b)/det;
    float y = (-c*d+f*a)/det;
    x = (x==-0.0)?0.0:x;  // Convert -0.0 to 0.0
    y = (y==-0.0)?0.0:y;
    cout << setiosflags(ios::fixed) << setprecision(3);
    cout << x << " " << y << endl;
  }

  return 0;
}

C++: #include<stdio.h>
int main(void){

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

	while(scanf("%lf %lf %lf %lf %lf %lf", &a, &b, &c, &d, &e, &f) != EOF){
		 
	 
	 if ( (a > 0 && d <　0)|| (a > 0 && d > 0)) {
		A = c*d - f*a;
		B = b*d - e*a;
        y = A / B;
    }
    
    else {
		A = c*d + f*a;
		B = b*d + e*a;
        y = A / B;
    }


    x = (c - y * b) / a;
	printf("%.3f %.3f\n" ,x , y);
	}
	return 0;

}

C++:  /*
Write a program which solve a simultaneous equation:

        ax + by = c
        dx + ey = f
The program should print x and y for given a, b, c, d, e and f(-1000 &#8804; a, b, c, d, e, f &#8804; 1000). You can suppose that given equation has a unique solution.
 */

#include <iostream>
#include <cstdio>

using namespace std;

void solve(int a, int b, int c, int d, int e, int f) {
	double x = (f - (double)e*c/b) / (d - (double)e*a/b);
	double y = (c - a*x) / b;
	if (x == 0) x = 0.000;
	if (y == 0) y = 0.000;
	printf("%4.3f %4.3f\n", x, y);
}

int main() {
	int a, b, c, d, e, f;
	while (cin >> a >> b >> c >> d >> e >> f) {
		solve(a,b,c,d,e,f);
	}
	return 0;
}

C++: #include "bits/stdc++.h"
using namespace std;
int main(){
    double a, b, c, d, e, f;
    while(cin >> a >> b >> c >> d >> e >> f){
        double M[2][3] = { 
            {a, b, c},
            {d, e, f}
        };
        double d = 0, m = 0;
        for(int i=0; i<2; ++i)
        {  
            d = M[i][i];
            for(int j=0; j<3; ++j){
                M[i][j] = M[i][j] / d;
            }
            for(int k = i+1; k<2; k++){
                m = M[k][i];
                for(int n = i; n<3; ++n){
                    M[k][n] = M[k][n] - m * M[i][n];
                }
            }
        }
        
        for(int i = 1; i>0; --i){
            for(int j= i-1; j>=0; --j){
                d = M[j][i];
                for(int n=i; n<3; ++n){
                    M[j][n] = M[j][n] - d * M[i][n];
                }
            }
        }
        for(int i=0; i<2; i++){
            if(i == 1) {
                cout << M[i][2] << endl; break;
            }
            cout << fixed << M[i][2] << " ";
            
        }
    }
    return 0;
}

C++: #include <stdio.h>

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*(double)c-(double)b*(double)f)/((double)e*(double)a-(double)b*d);
		y = ((double)d*(double)c-(double)a*(double)f)/((double)b*(double)d-(double)a*e);
		printf("%.3f %.3f\n", x, y);
	}
}

C++: #include <iostream>                                             
#include <cstdio>                                               
#include <cmath>                                                
using namespace std;                                            
                                                                
int main(void) {                                                
  double a, b, c, d, e, f;                                      
  while (cin >> a >> b >> c >> d >> e >> f) {                   
    double x = (b*f-c*e)/(b*d-a*e);                             
    double y = (c-a*x)/b;                                       
    if (x>=0.0) {                                               
      x = (int)(x+0.0005);                                      
    } else {                                                    
      x = -(int)(abs(x)+0.0005);                                
    }                                                           
    if (y>=0.0) {                                               
      y = (int)(y+0.0005);                                      
    } else {                                                    
      y = -(int)(abs(y)+0.0005);                                
    }                                                           
    printf("%.3f %.3f\n",x , y);                                
  }                                                             
  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);
if(x/1000== -0.000) x=0.000;
if(y/1000== -0.000) y=0.000;
  printf("%.3f %.3f\n",x,y);
  return 0;
}