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x+3y=12 ->4+y+3y=12
4y=12-4
4y=8
y=2
x-y=4
x-2=4
x=4+2=6
x + 3y = 12
--------------- -
-4y = -8
y = 2
x - y = 4
x - 2 = 4
x = 4 + 2
x = 6
HP = {6, 2}
Jawaban D