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3y - z = 21
2x + y + 3z = -5
2x + y + 3z = -5
2x + 2y + 2z = 6
----------------------- -
-y + z = - 11
3y - z = 21
-y + z = -11
---------------- +
2y = 10
y = 5
-y + z = -11
-5 + z = -11
z = -11 + 5
z = -6