3x-2y+z=11 2x+y-2z=23 -x+3y+z=6 nilai x.y.z adalah.. please kak jawab :)

3x - 2y + z = 11
-3x + 9y + 3z = 16
----------------------- +
7y + 4z = 27

2x + y - 2z = 23
-2x + 6y + 2z = 12
----------------------- +
7y = 35
y = 5

7y + 4z = 27
4z = 27 - 35
4z = -8
z = -2

-x + 3y + z = 6
-x + 15 - 2 = 6
x = 13 - 6
x = 7

x.y.z
7 . 5 . -2
= -70