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>
#include <iomanip>
using namespace std;

int main(){
	int count = 0;
	double x[100],y[100];
	double a, b, c, d, e, f;
	while(cin >> a >> b >> e >> c >> d >> f){
		x[count] = (e*d-b*f)/(a*d-b*c);
		y[count] = (a*f-e*c)/(a*d-b*c);
		if(x[count] == -0){
			x[count] = 0;
		}
		if(y[count] == -0){
			y[count] = 0;
		}
		count++;
	}
	for(int i = 0; i < count; i++){
		cout << fixed << setprecision(3) << x[i] << " " << y[i] << endl;
	}
}

C++: 
/* vo00_04.cpp */
#include <iostream>
#include <iomanip>
#include <cmath>
#include <cstdio>
using namespace std;

int is_double(double dl);
double m_round(double d);
int dmax(int d1, int d2) { return (d1 < d2) ? d2 : d1; }

int main()
{
	double x1, y1, a1;
	double x2, y2, a2;
	double x, y;
	bool f_x, f_y;

	while (true) {
		cin >> x1 >> y1 >> a1 >> x2 >> y2 >> a2;
		if (cin.eof()) break;
		


		f_x = false; f_y = false;

		int p = dmax(dmax(is_double(x1), is_double(x2)), dmax(is_double(y1), is_double(y2)));
		if (p) { p *= 10; x1 *= p; x2 *= p; y1 *= p; y2 *= p; }

		if (x1 && x2) {
			int temp = x1;
			x1 *= x2; y1 *= x2; a1 *= x2;
			x2 *= temp; y2 *= temp; a2 *= temp;

			double y3 = y2 - y1, a3 = a2 - a1;

			y = a3 / y3;
			f_y = true;
		}

		if (y1 && y2) {
			int temp = y1;
			x1 *= y2; y1 *= y2; a1 *= y2;
			x2 *= temp; y2 *= temp; a2 *= temp;

			double x3 = x2 - x1, a3 = a2 - a1;

			x = a3 / x3;

			f_x = true;
		}

		if (!f_x || !f_y) {
			// どちらかに0があれば
			if (!x1) { y = a1 / y1; f_y = true; }
			else if (!x2) { y = a2 / y2; f_y = true; }

			if (!y1) { x = a1 / x1; f_x = true; }
			else if (!y2) { x = a2 / x2; f_x = true; }

			if (f_x) {
				if (x1) { x1 *= x; a1 -= x1; y = a1 / y1; }
				else if (x2) { x2 *= x; a2 -= x2; y = a2 / y2; }

				f_y = true;
			}
			if (f_y) {
				if (y1) { y1 *= y; a1 -= y1; x = a1 / x1; }
				else if (y2) { y2 *= y; a2 -= y2; x = a2 / x2; }

				f_x = true;
			}
		}

		if (f_x && f_y) {
			x = m_round(x); y = m_round(y);
			printf("%.3lf %.3lf\n", x, y);
		}
	}

	return 0;
}

int is_double(double dl)
{
	dl = fabs(dl);
	int d = (int)dl;
	double temp = dl - (double)d;

	if (!temp) return 0;

	else {
		int i;
		for (i = 0; temp < 1; ++i) temp *= 10;

		return i;
	}
}

double m_round(double d)
{
	bool flag = false;
	if (d < 0) { flag = true; d = -d; }

	d *= 1000;
	d += 0.5;

	int t1 = (int)d;
	double t2 = d - (double)t1;
	d -= t2;

	d /= 1000;

	if (flag) { d = -d; }

	return d;
}

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

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++: /*http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=0004&lang=jp*/

#include <iostream>

using namespace std;

int main(){
    double a, b, c, d, e, f;
    while(cin>>a>>b>>c>>d>>e>>f) {
        printf("%.3f %.3f\n",((int)((c * e - b * f) / (a * e - b * d)*10e3+0.5))/10e3,((int)((a * f - c * d) / (a * e - b * d)*10e3+0.5))/10e3);
    }
    return 0;
}

C++: #include <iomanip>
#include <iostream>
#include <vector>
#define N 2
 
using namespace std;
typedef vector< vector<double> > Equation;
 
int main()
{ 
    Equation c(N, vector<double>(N + 1));
	const double EPS = 1.0e-10;

	while (cin)
	{
		// input
		for (int i = 0; i < N; ++i)
			for (int j = 0; j < N + 1; ++j)
				cin >> c[i][j];

		// Gaussian elimination
		// 1. Forward elimination
        for (int i = 0; i < N - 1; ++i)
            for (int j = i + 1; j < N; ++j)
            {
                double d = c[j][i] / c[i][i];
                for (int k = i + 1; k <= N; ++k)
                    c[j][k] -= c[i][k] * d;
            }
 
		// 2. Back substitution
        for (int i = N - 1; i >= 0; --i)
        {
            double d = c[i][N];
            for (int j = i + 1; j < N; ++j)
                d -= c[i][j] * c[j][N];
            c[i][N] = d / c[i][i];
        }
 
		for (int i = 0; i < N; ++i)
			if (-0.0005 < c[i][N] && c[i][N] < 0.0 + EPS) 
				c[i][N] = 0.0;

        cout << setprecision(3) << fixed << c[0][N];
        for (int i = 1; i < N; ++i)
            cout << " " << c[i][N];
        cout << endl;
    }
 
    return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <vector>
#include <string>
#include <sstream>
#include <algorithm>
#include <functional>
using namespace std;

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

C++: #include <iostream>
#include <math.h>
#include <cstdio>

using namespace std;

double a, b, c, d, e, f;
double tmp_x, tmp_y, tmp;

int main()
{
	while (cin >> a >> b >> c >> d >> e >> f) {
		tmp_y = (d*c - a*f) / (d*b - a*e);
		tmp_x = (c - b*tmp_y) / a;
		printf("%.3f %.3f\n", tmp_x, tmp_y);
	}
	return 0;
}

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

int main(void){
  double a,b,c,d,e,f;
  while(cin>>a>>b>>c>>d>>e>>f){
  double p = a * e - b * d;
  double x = (e * c - b * f) / p;
  double y = (a * f - d * c) / p;
  if(0>x&&x>-0.0004)x=0;if(0>y&&y>-0.0004)y=0;
  printf("%.3f %.3f\n",x,y);
  }

}

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) != -1) {
        printf("%.3f %.3f\n", (c*e - b*f) / (a*e - b*d), (c*d - a*f) / (b*d - a*e));
    }

    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)
	{
		-1000 <= a, b, c, d, e, f <= 1000;
		x= (c*e-b*f)/(a*e-b*d);
		y= (c*d-a*f)/(b*d-a*e);
		if(x == -0.00){x=0.00;}
		if(y == -0.00){y=0.00;}
		cout<<setprecision(3)<<x<<y<<endl;
                cout<<fixed;
		cout<<x<<" "<<y<<endl;
	}
	return 0;
}