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4/x-8/y=4
Eliminasi -8/y
20/x-4/x=16/x=8-4=4
x=4×1/16=4/16=1/4
4/1/4-8/y=4
4×4/1-8/y=4
16-8/y=4
-8/y=4-16
y=-12×1/-8=3/2