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3x - 4y = 9
eliminasi x:
6x - 9y = 21
6x - 8y = 18 (-)
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-y = 3
y = -3
eliminasi y:
8x - 12y = 28
9x - 12y = 27 (-)
----------------------
-x = 1
x = -1
x+y = (-1) + (-3)
= -4