// luogu-judger-enable-o2
#include
#include
const double eps = 1e-9;
inline int read() {
char c = getchar(); int x = 0, f = 1;
while(c <'0' || c > '9') { if(c == '-')f = -1; c = getchar(); }
while(c >= '0' && c <= '9') x = x * 10 + c - '0', c = getchar();
return x * f;
}
const int MAXN = 101;
int N;
double a[MAXN][MAXN];
double Ans[MAXN];
double fabs(double x) {return x <0 ? -x : x;}
void Gauss() {
for(int i = 1; i <= N; i++) {
int mx = i;
for(int j = i + 1; j <= N; j++)
if(fabs(a[j][i]) > fabs(a[mx][i])) mx = j;
if(mx != i) std::swap(a[mx], a[i]);
if(fabs(a[i][i]) >= eps)
for(int j = 1; j <= N; j++) {
if(i == j) continue;
double temp = a[j][i] / a[i][i];
for(int k = 1; k <= N + 1; k++)
a[j][k] -= temp * a[i][k];
}
}
int NoSolution = 0, ManySolution = 0;
for(int i = 1; i <= N; i++) {
int num = 0;
for(int j = 1; j <= N + 1; j++)
if(a[i][j] == 0) num ++;
else break;
if(num == N + 1) ManySolution = 1;
if(num == N && a[i][N+1] != 0) NoSolution = 1;
}
if(NoSolution) {printf("-1");return ;}
if(ManySolution) {printf("0");return ;}
for(int i = N; i >= 1; i--) {
Ans[i] = a[i][N+1] / a[i][i];
for(int j = i; j >= 1; j--)
a[j][N+1] -= a[j][i] * Ans[i];
}
for(int i = 1; i <= N; i++)
printf("x%d=%.2lf\n",i,Ans[i]);
}
int main() {
#ifdef WIN32
freopen("a.in", "r", stdin);
#endif
N = read();
for(int i = 1; i <= N; i++)
for(int j = 1; j <= N + 1; j++)
a[i][j] = read();
Gauss();
return 0;
}