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y = - x- 2
pers 2 : -x + y + 2z = 4
pers 1 --> 2 : -x + (-x- 2) + 2z = 4
-2x - 2+ 2z = 4
-2x + 2z = 6
---------------------- : 2
-x + z = 3
sehingga z - x = 3