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X = 13 masukkan ke persamaan
3X-Y = 12
3(13)-Y = 12
39 -12 = Y
27 = Y
2. 4X = 8
X = 2 masukkan
X -2Y = 10
-2Y = 10-2
-2Y = 8
Y = -4
jadi HP = { 2,-4 }