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3x - 2y = 12
----------- +
10x = 20
x = 20/10
x = 2
substitusi: 7x + 2y = 8
7 . 2 + 2y = 8
14 + 3y = 8
3y = 8 - 14
3y = -6
y = -6/3
y = -2
grafik nya gambar sendiri ya kan udh di ketahui tu x dan y nya
HP = {2,-2}