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x + y = 8
x = 8 - y
x-y=2
8-y-y = 2
-2y = -6
y = 3
x = 8 - y
x = 8 - 3
x = 5
eliminasi
x+y=8
x-y=2 (tambah)
2x=10
x=5
x + y =8
5 + y =8
y = 8-5
y = 3