import numpy as np
A = np.array([[7, 3, 0, 1], [0, 1, 0, -1], [1, 0, 6, -3], [1, 1, -1, -1]])
B = np.array([8, 6, -3, 1])
X = np.linalg.inv(A).dot(B)

print("x是:{} ".format(X[0]))
print("y是:{} ".format(X[1]))
print("z是:{} ".format(X[2]))
print("k是:{} ".format(X[3]))