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 <cmath>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <list>
#include <deque>
#include <algorithm>
#include <iomanip>
#include <functional>

#define REP(i, n) for(int i = 0;i < (n); i++)
#define REP2(i, x, n) for(int i = (x); i < (n); i++)
#define REPR(i, n) for(int i = (n); i >= 0; i--)

#define ALL(a) (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define DESCSORT(c) sort(c.begin(), c.end(), greater<int>())

#define LL long long int
#define LD long double

#define PI 3.14159265358979

using namespace std;

//================================================
int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	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);
		if (X == -0) X = 0.0;
		if (Y == -0) Y = 0.0;

		cout << fixed << setprecision(3) << X << " " << Y << "\n";
	}
	return 0;
}

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

// ax + by = c
// dx + ey = f
// det(A) = ae-bd
// A^(-1) = 1/det(A)* ((e,-b),(-d,a))
// x = 1/det(A) *(ce-bf)
// y =			*(-cd+af)

int main(int,char**){
	double a,b,c,d,e,f;
	double x,y;
	std::cout<< std::setprecision(3) << std::setiosflags(std::ios::fixed);
	while(std::cin >> a){
		std::cin >> b >> c >> d >> e >> f;
		double det(a*e-b*d);
		x= (c*e-b*f)/det;
		y= (-c*d+a*f)/det;
		std::cout<< x << ' ' << y<<std::endl;
	}
	return 0;
}

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

int main(){

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

	while(1){
		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);

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

	return 0;
}

C++: #include <cstdio>

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

C++: #include<iostream>
#include<iomanip>
#include<vector>
#include<map>
#include<string>
using namespace std;
/*
??£???????¨????
	ax + by = c
	dx + ey = f
????§£x, y???????????????????????°??????
*/
int main() {
	int a, b, c, d, e, f;
	int cnt = 0;						//??\??????????????£???????¨????????????°
	std::vector<double> x_vector;		//x????§£???????´?
	std::vector<double> y_vector;		//y????§£???????´?

#if 0
	while (cnt < 2) {
		cin >> a >> b >> c >> d >> e >> f;
#else
	while (cin >> a >> b >> c >> d >> e >> f) {
#endif
		double x = (b * f - c * e) / (b * d - a * e);
		double y = (c * d - a * f) / (b * d - a * e);

		cnt++;
		x_vector.push_back(x);
		y_vector.push_back(y);
	}

	for (unsigned int i = 0; i < cnt; i++) {
		int dummy_x = x_vector[i];		//?????£????????????????°???°?????\?????????
		int dummy_y = y_vector[i];		//?????£????????????????°???°?????\?????????

		//x?????????????°???°????¬¬4???????????¨?????\
		if (5 <= (x_vector[i] * 10000 - dummy_x * 10000)) {
			x_vector[i] += 0.001;
		}

		//y?????????????°???°????¬¬4???????????¨?????\
		if (5 <= (y_vector[i] * 10000 - dummy_y * 10000)) {
			y_vector[i] += 0.001;
		}

		std::cout << std::fixed;
		std::cout << std::setprecision(3) << x_vector[i] << " ";
		std::cout << std::setprecision(3) << y_vector[i] << endl;
	}

	//???????????°
	//while (1);

	return 0;
}

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

int main()
{
	float a,b,c,d,e,f,x,y=0;
	
	while(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,y);
	}
	
	return 0;
}

C++: #include <iostream>

using namespace std;

int main()
{
	double	x,a,b,c,d,e,f;
	cin >> a >> b >> c >> d >> e >> f;
	//a*x-b*d*x/e =c-b*f/e
	for(x=-1000000;x<1000000;x++)
	{
		if(a*(x/1000)+b*((f-d*(x/1000))/e) == c)
		{
			printf("%0.3lf",x/1000);
			break;
		}
	}
	cout << endl;
	
	printf("%0.3lf",(f-d*x/1000)/e); //yÌoÍ
}

C++: #include <iostream>
#include <stdlib.h>
#include <string.h>
#include <sstream>
#include <iostream>
#include <math.h>
#include <iomanip>

using namespace std;

string float_to_string(float f, int digits)
{
  if (f == 0) {
    f = 0;
  }
  ostringstream oss;
  oss << setprecision(digits) << setiosflags(ios::fixed) << f;
  return oss.str();
}

void calc_and_output(int *c)
{
  float x = (float)(c[1]*c[5]-c[2]*c[4])/(c[1]*c[3]-c[0]*c[4]);
  float y = (float)(c[0]*c[5]-c[2]*c[3])/(c[0]*c[4]-c[1]*c[3]);

  cout << float_to_string(x, 3) << " " << float_to_string(y, 3) << endl;
}

int main(int argc, char const* argv[])
{
  int c[6];

  string line;
  while (getline(cin, line)) {
    istringstream iss(line);
    int val;
    int c[6];
    for (int i = 0; i < 6; i++) {
      iss >> val;
      c[i] = val;
    };

    calc_and_output(c);
  }

  return 0;
}

C++: #include <iostream>
#include <iomanip>
#define REP(i,n) for(int i=0;i<n;i++)
using namespace std;

int main() {
    int a[3];
    int b[3];
    int y[3];
    int x[3];
    while(true) {
    REP(i,3)
        cin >> a[i];
    REP(i,3)
        cin >> b[i];
    if(!cin)
        return 0;
    REP(i,3) 
        y[i] = b[i]*a[0] - a[i]*b[0];
    REP(i,3)
        x[i] = b[i]*y[1] - y[i]*b[1];
    double o[2];
    o[0] = x[2]/double(x[0]);
    o[1] = y[2]/double(y[1]);
    REP(i,2)
        o[i] = (o[i]==0)?0:o[i];
    cout << fixed << setprecision(3) << o[0] << ' ';
    cout << fixed << setprecision(3) << o[1] << '\n';
    }
}

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

int main()
{
    double a,b,c,d,e,f;
    double x,y;
    
    while(cin >> a >> b >> c >> d >> e >> f){
        if(b*d - a*e != 0){
         
         double tmp1,tmp2;
        tmp1= (c*e - b*f)/ (a*e - b*d);
        tmp2 = (c*d - a*f)/(b*d - a*e);
        x = tmp1;
        y = tmp2;
            if(x == 0)x = 0;
            if(y == 0)y = 0;
         printf("%.3f %.3f",x,y);
        }
    }
    return 0;
}

C++: #include <cstdio>

int main(){
	int p1[5],p2[5],a[5];
	float h[5];

	while(scanf("%d %d %d %d %d %d",&p1[1],&p1[2],&p1[3],&p2[1],&p2[2],&p2[3])!=EOF){
		p1[2] = p1[2]*p2[1];
		p1[3] = p1[3]*p2[1];

		p2[2] = p2[2]*p1[1];
		p2[3] = p2[3]*p1[1];

		p1[1] = p1[1]*p2[1];

		a[1] = p1[2]-p2[2];
		a[2] = p1[3]-p2[3];

		h[2] = a[2]/a[1];

		if(p1[2]*h[2] <= 0)
		{
			h[1] = (p1[3]+(p1[2]*h[2]))/p1[1];
		}else if(p1[2]*h[2] >= 0)
		{
			h[1] = (p1[3]-(p1[2]*h[2]))/p1[1];
		}

		printf("%.3f %.3f\n", h[1],h[2]);
	}
}