import numpy as np
import sys
 
n = int(input('Enter number of unknowns: '))
a = np.zeros((n,n+1))
x = np.zeros(n)
print('Enter Augmented Matrix Coefficients:')
for i in range(n):
    for j in range(n+1):
        a[i][j] = float(input( 'a['+str(i)+']['+ str(j)+']='))
for i in range(n):
    if a[i][i] == 0.0:
        sys.exit('Divide by zero detected!')
         
    for j in range(i+1, n):
        ratio = a[j][i]/a[i][i]
         
        for k in range(n+1):
            a[j][k] = a[j][k] - ratio * a[i][k]
 
x[n-1] = a[n-1][n]/a[n-1][n-1]
 
for i in range(n-2,-1,-1):
    x[i] = a[i][n]
     
    for j in range(i+1,n):
        x[i] = x[i] - a[i][j]*x[j]
     
    x[i] = x[i]/a[i][i]
 
print('\nThe solution is: ')
for i in range(n):
    print('X%d = %0.2f' %(i,x[i]), end = '\t')