#include<cstdio>

#include<iostream>

#include<cmath>

#define R register int

using namespace std;

const double eps=1E-;

inline int g() {

    R ret=,fix=; register char ch; while(!isdigit(ch=getchar())) fix=ch=='-'?-:fix;

    do ret=ret*+(ch^); while(isdigit(ch=getchar())); return ret*fix;

}

long double a[][];

int n,m,k;

inline bool ck0(double x) {return x<eps&&x>-eps;}

inline void Gauss() {

    for(R i=,pos=;i<=n&&pos<=n;++i) { R p;

        for(p=pos;p<=n&&ck0(a[p][i]);++p) ;

        if(p==n+) continue;

        if(pos!=p) for(R j=;j<=n+;++j) swap(a[pos][j],a[p][j]);

        for(R j=pos+;j<=n;++j) if(!ck0(a[j][i])){

            register long double t=a[j][i]/a[pos][i];

            for(R k=;k<=n+;++k) a[j][k]-=a[pos][k]*t;

        } ++pos;

    } register bool flg1=false,flg2=false;

    for(R i=;i<=n;++i) { R j=;

        while(ck0(a[i][j])&&j<=n+) ++j;

        if(j==n+) flg1=true;

        if(j>n+) flg2=true;

    } if(flg1) {putchar('-'),putchar(''); return ;}

    if(flg2) {putchar(''); return ;}

    for(R i=n;i>=;--i) {

        for(R j=n;j>=i+;--j) a[i][n+]-=a[i][j]*a[j][n+];

        a[i][n+]/=a[i][i];

    } for(R i=;i<=n;++i) if(ck0(a[i][n+])) printf("x%d=0\n",i); else printf("x%d=%.2Lf\n",i,a[i][n+]);

}

signed main() {

    n=g(); for(R i=;i<=n;++i) for(R j=;j<=n+;++j) a[i][j]=g(); Gauss(); //while(1);

}