Go: package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

var scanner = bufio.NewScanner(os.Stdin)

func nextString() string {
	scanner.Scan()
	return scanner.Text()
}

func nextFloat64() (float64, error) {
	return strconv.ParseFloat(nextString(), 64)
}

func mathRound(f float64) float64 {
	return math.Floor(f + .5)
}

func round(x float64) float64 {
	if math.Abs(x) < 0.001 {
		return 0
	}
	return mathRound(x*1000) / 1000
}

func main() {
	scanner.Split(bufio.ScanWords)
	for {
		a, err := nextFloat64()
		if err != nil {
			break
		}
		b, _ := nextFloat64()
		c, _ := nextFloat64()
		d, _ := nextFloat64()
		e, _ := nextFloat64()
		f, _ := nextFloat64()

		detA := a*e - b*d
		x := (c*e - b*f) / detA
		y := (a*f - c*d) / detA

		fmt.Printf("%.3f %.3f\n", round(x), round(y))
	}
}

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



int main()
{
	double a[3], b[3];
	while (cin >> a[0] >> a[1] >> a[2] >> b[0] >> b[1] >> b[2])
	{
		if (a[0] == 0)
		{
			double c = a[2] / a[1];
			double d = (b[2] - b[1] * c) / b[1];
			a[2] = d;
			b[2] = d;
		}
		else
		{
			double c = 1;
			if (b[0] != 0)
			{
				c = a[0] / b[0];
				b[1] = b[1] * c - a[1];
				b[2] = b[2] * c - a[2];
			}
			b[2] /= b[1];
			b[1] = 1;
			a[2] -= b[2] * a[1];
			a[2] /= a[0];
		}
		if (a[2] < 0.0001 && a[2] > -0.0001)
			a[2] = 0.000;
		if (b[2] < 0.0001 && b[2] > -0.0001)
			b[2] = 0.000;

		cout << fixed << setprecision(3) << a[2] << b[2] << endl;
	}

	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)
	{
		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)<<fixed;
		cout<<x<<" "<<y<<endl;
	}
	return 0;
}

C++: #include <stdio.h>

int main()
{
	int a,b,c,d,e,f;
	double def;
	double x,y;
	while(scanf("%d %d %d %d %d %d",&a, &b, &c, &d, &e, &f) != EOF){
		if((a * e - b * d) != 0){
			def = 1 / (double)(a * e - b * d);
		}else{
			printf("NA\n");
			continue;
		}
		x = def * (double)(e * c - b * f);
		y = def * (double)(a * f - d * c);
		printf("%.3lf %.3lf\n",x,y);
	}
	return 0;
}

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



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


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

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

	
	}


	
	
	return 0;
}

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

int main(){
	long double a11=0,a12=0,c=0,a21=0,a22=0,f=0;
	while(cin>>a11>>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);}
		cout<<fixed<<setprecision(3)<<x<<" "<<y<<endl;
	}
	return 0;
}

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

class data {
public:
	int number[6];
	double substitute_x(int num){
		return (number[2] - number[1] * num) / number[0];
	}
	double quadratic_y() {
		return
			(number[2] * number[3] - number[0] * number[5])
			/ (number[1] * number[3] - number[0] * number[4]);
	}
};

int main() {
	data temp;
	while (cin >> temp.number[0]) {
		for (int i = 1; i < 6; i++) {
			cin >> temp.number[i];
		}
		cout << fixed << setprecision(3) 
			<< temp.substitute_x(temp.quadratic_y()) << flush;
		cout << " " << flush;
		cout << fixed << setprecision(3) 
			<< temp.quadratic_y() << endl;
	}
	return 0;
}

C++: #include<stdio.h>
int main(){
	int X,Y;
double a,b,c,d,e,f,x,y;
double p[2][3]={0};
y=0;x=0;
while(1){
scanf("%lf",&a);scanf("%lf",&b);scanf("%lf",&c);
scanf("%lf",&d);scanf("%lf",&e);scanf("%lf",&f);
if(a==EOF&&b==EOF&&c==EOF&&d==EOF&&e==EOF&&f==EOF)break;
y=(d*c-a*f)/(b*d-a*e);
x=(e*c-b*f)/(e*a-b*d);
X=x*10000;
Y=y*10000;
if((X)%10>=5)x+=0.0005;
else if((X)%10<=-5)x-=0.0005;
if((Y)%10>=5)y+=0.0005;
else if((Y)%10<=-5)y-=0.0005;

printf("%.3f %.3f\n",x,y);
}
return 0;
}

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

 int main() {

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

	 while (std::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);

		
		 std::cout << std::fixed;
		 std::cout << std::setprecision(4) << x << " " << std::setprecision(4) << y << std::endl;
	 }



}

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



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

C++: #pragma GCC optimize "O3"
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#define whole(f,x,...) ([&](decltype((x)) whole) { return (f)(begin(whole), end(whole), ## __VA_ARGS__); })(x)
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define REP_FROM(i,m,n) for (int i = (m); (i) < int(n); ++(i))
#define REP_REV(i,n) for (int i = (n)-1; (i) >= 0; --(i))
#define REP_FROMREV(i,m,n) for (int i = (n)-1; (i) >= int(m); --(i))
#define CLR(a) memset((a), 0 ,sizeof(a))
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
#ifndef LOCAL
#define cerr if (false) cerr
#endif
using namespace std;
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}
template<class T> inline T sqr(T x) {return x*x;}
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

template <class T> inline void setmax(T & a, T const & b) { a = max(a, b); }
template <class T> inline void setmin(T & a, T const & b) { a = min(a, b); }
template <class T> T sq(T x) { return x * x; }
template <class T> T clamp(T a, T l, T r) { return min(max(a, l), r); } // [l, r]
const double EPS = 1e-10;
const double PI  = acos(-1.0);

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

int main(int argc, char *argv[]) {
	// Something to do
	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<iostream>
#include<cstdio>
#define LL long long
using namespace std;

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

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){
        double g = b*d - a*e;
        printf("%.3lf %.3lf\n", ((long long)((1000*(b*f-c*e)/g)))/1000.0, ((long long)((1000*(d*c-a*f)/g)))/1000.0);
    }
    return 0;
}