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.Print(x)
		fmt.Println(".000")
		fmt.Print(y)
		fmt.Println(".000")
	}
}

C++: #include <iostream>
#include <cstdio>
int main(){
double a,b,c,d,e,f,x,y;
while(std::cin>>a>>b>>c>>d>>e>>f){
x=(b*f-c*e)/(b*d-a*e);
y=(f*a-d*c)/(a*e-b*d);
printf("%.3f %.3f\n",x==-0?0:x, y==-0?0:y);
}
}

C++: #include<iostream>
#include<string>
#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=(c-(b*f/e))/(a-(b*d/e));
		y=(c-a*x)/b;
		cout<<fixed<<setprecision(3)<<x<<endl;
		cout<<fixed<<setprecision(3)<<y<<endl;
	}
	return 0;
}

C++: #include<iostream>
#include<cstdio>
using namespace std;
int 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-b*(c*d-a*f)/(b*d-a*e))/a; 
    y = (c*d-a*f)/(b*d-a*e);
    if(x == -0)x = 0;
    if(y == -0)y = 0;
    printf("%.3f %.3f",x,y);
  }
}

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

using namespace std;

int det(int a, int b, int c, int d) {
	return a * d - b * c;
}

int main() {
	int a[6];
	while(cin) {
		for(int i = 0; i < 6; i++)
			cin >> a[i];
		if(!cin)
			break;
		int d = det(a[0], a[1], a[3], a[4]);
		int x1 = det(a[2], a[1], a[5], a[4]);
		int x2 = det(a[0], a[2], a[3], a[5]);
		cout << setprecision(3) << fixed << 1. * x1 / d + 1e-9 << " ";
		cout << setprecision(3) << fixed << 1. * x2 / d + 1e-9 << endl;
	}

	return 0;
}

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

int main() {
	double a, b, c, d, e, f, x, y;
	while (cin >> a >> b >> c >> d >> e >> f) {
		double w = 1.0 / (a*e - b*d);
		double x = w*(e*c - b*f);
		double y = w*(-d*c + a*f);
		if (x == 0) x = 0;
		if (y == 0) y = 0;
		printf("%.3f %.3f", x, y);
	}
	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <numeric>
#include <string>
#include <vector>
#include <list>
#include <iterator>

#include <cstdio>
#include <cmath>

#define DIM 2
#define EPS (5*10e-4)

typedef std::vector<double> Vec;
typedef std::vector<Vec> Mat;
typedef std::pair<Mat,Vec> Eq;

double removeMinusZero(double x){
	if ( fabs(x)< EPS ){
		return 0.0;
	}
	else {
		return x;
	}
}

int main(void){
	using namespace std;

	list<Eq> input;

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

	cout << fixed << setprecision(3);

	while(cin >> a >> b >> c >> d >> e >> f){
		Vec m1, m2;
		m1.push_back(a);
		m1.push_back(b);
		m2.push_back(d);
		m2.push_back(e);

		Vec vec;
		vec.push_back(c);
		vec.push_back(f);

		Mat mat;
		mat.push_back(m1);
		mat.push_back(m2);

		Eq eq = make_pair(mat,vec);

		input.push_back(eq);
	}

	for(auto itr = input.begin(); itr!=input.end(); ++itr){
		auto mat = itr->first;
		auto vec = itr->second;

		Vec output(DIM);

		auto det = mat[0][0] * mat[1][1] - mat[0][1] * mat[1][0];

		mat[0][1] = -mat[0][1];
		mat[1][0] = -mat[1][0];
		swap(mat[0][0],mat[1][1]);

		for (int i=0; i<DIM; i++){
			output[i] = inner_product(vec.begin(), vec.end(), mat[i].begin(), 0);
		}
		std::transform(output.begin(), output.end(),output.begin(), std::bind2nd(divides<double>(),det));
		cout << removeMinusZero(output[0]) << " " << removeMinusZero(output[1]) << endl;
	}

}

C++: #include <cstdio>
#define abs(x) (x>0?x:-x)

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

	while(scanf("%d %d %d %d %d %d",&a,&b,&c,&d,&e,&f)!=EOF){
		g=a*e-b*d;
		x=e*c+(-b)*f;
		y=(-d)*c+a*f;
		x=(x==0?0.000:x/g);
		y=(y==0?0.000:y/g);
		printf("%.3lf %.3lf\n",x,y);
	}
	return 0;
}

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

const double EPS=1e-8;
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<iostream>
#include<iomanip>
using namespace std;

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

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

/*
 * Wrong Answer
 * 2015-06-26 02:00
 */

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

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

	return 0;
}

C++: #include <iostream>
#include <string>
#include <vector>
#include <sstream>

using namespace std;
using DataSet = vector<double>;

void readInputData(vector<string> input_data){
    string buff;
    while(getline(cin, buff)){
        input_data.push_back(buff);
    }
}

void _parseString(const string& input_data, DataSet& data_set) {
    data_set.resize(6);

    stringstream ss;
    ss << input_data;
    ss >> data_set[0] >> data_set[1] >> data_set[2]
        >> data_set[3] >> data_set[4] >> data_set[5];
}

void parseString(const vector<string>& input_data, vector<DataSet>& data_set) {
    for(int i = 0; i < input_data.size(); ++i) {
        DataSet buff;
        _parseString(input_data[i], buff);
        data_set[i] = buff;
    }
}

double determinant2d(const DataSet& data){
    return data[0] * data[4] - data[1] * data[3];
}

void inverse2d(DataSet& data){
    double det = determinant2d(data);

    double t = data[0];
    data[0] = data[4];
    data[4] = t;

    data[1] = -data[1];
    data[3] = -data[3];

    data[0] /= det;
    data[1] /= det;
    data[3] /= det;
    data[4] /= det;
}


void calculateXY(const DataSet& data, vector<double>& result){
    result.resize(2);
    result[0] = data[0] * data[2] + data[1] * data[5];
    result[1] = data[3] * data[2] + data[4] * data[5];
}

void solve(vector<DataSet>& data_set){
    for(int i = 0; i < data_set.size(); ++i){
        vector<double> buff;

        inverse2d(data_set[i]);

        calculateXY(data_set[i], buff);

        cout << buff[0] << " " << buff[1] << endl;
    }
}


void doAllProcess(){
    vector<string> input_data;
    readInputData(input_data);

    vector<DataSet> data_set;
    parseString(input_data, data_set);
    
    solve(data_set);
}

int main(){
    doAllProcess();

    return 0;
}