#include<cstdio>

 void swap(double &x,double &y)

 {

     double t=x;x=y;y=t;

 }

 double v(double rx)

 {

     return rx>?rx:(-rx);

 }

 int n;

 double a[][];

 double x[];

 const double eps=0.00001;

 int main()

 {

     scanf("%d",&n);

     for(int i=;i<=n;i++)

         for(int j=;j<=n+;j++)

             scanf("%lf",&a[i][j]);

     for(int i=;i<=n;i++)

     {

         int p=i;

         for(int j=i+;j<=n;j++)

             if(v(a[j][i])>v(a[p][i]))p=j;

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

         if(v(a[i][i])<eps)continue;

         double div=a[i][i];

         for(int j=i;j<=n+;j++)a[i][j]/=div;

         for(int j=;j<=n;j++)

         {

             if(i==j)continue;

             double div=a[j][i];

             for(int k=;k<=n+;k++)

                 a[j][k]-=div*a[i][k];

         }

     }

     int no=,inf=;

     for(int i=;i<=n;i++)

     {

         int p=;

         while(p<=n+&&v(a[i][p])<=eps)p++;

         if(p==n+)no=;

         if(p>n+)inf=;

     }

     if(no){printf("-1");return ;}

     if(inf){printf("");return ;}

     for(int i=n;i;i--)x[i]=a[i][n+];

     for(int i=;i<=n;i++)

         printf("x%d=%.2lf\n",i,x[i]);

     return ;

 }