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x + 2y = 8
3x + 2y = 12
------------------- --
-2x = -4
x = 2
x + 2y = 8
2 + 2y = 8
2y = 6
y = 3
Z = 10x + 15y = 10.2 + 15.3 = 20 + 45 = 65
smoga membantu , kalo salah maaf :)