#include<cstdio>
#include<cstring>
#include<iostream>
using namespace std;
const double eps=1e-7;
const int N=110;
int T,n;
double a[N][N],ans[N],b[N];
double F(double A)
{
	if(A<0) return -A;
	return A;
}
int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
			scanf("%lf",&a[i][j]);
		scanf("%lf",&b[i]);
	}
	for(int i=1;i<=n;i++)
	{
		int Max=i;
		for(int j=i+1;j<=n;j++)
			if(F(a[j][i])>F(a[Max][i])) Max=j;
		for(int l=i;l<=n;l++) swap(a[i][l],a[Max][l]);
		swap(b[i],b[Max]);
		if(F(a[i][i])<eps) continue;
		for(int j=i+1;j<=n;j++)
		{
			double k=a[j][i]/a[i][i];
			for(int l=i;l<=n;l++)
				a[j][l]-=k*a[i][l];
			b[j]-=k*b[i];
		}
	}
	for(int i=n;i>=1;i--)
	{
		for(int j=n;j>i;j--)
			b[i]-=ans[j]*a[i][j];
		ans[i]=b[i]/a[i][i];
	}
	for(int i=1;i<=n;i++)
	{
		if(F(a[i][i])<eps)
		{
			if(!b[i]) {printf("0");return 0;}
			else T=1;
		}
	}
	if(T) {printf("-1");return 0;}
	for(int i=1;i<=n;i++) 
	{
		if(ans[i]==-0) ans[i]=0;
		printf("x%d=%.2lf\n",i,ans[i]);
	}
	return 0;
}