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4x-2y = 12 ----> dikali 3
________
12x+16y = -8
12x-6y = 36
_____________ (Dikurangi)
22y = -44
y = -2
Subsitusikanke salasatu persamaan lnier->
4x-2y = 12
4x-2(-2) = 12
4x+4=12
4x = 8
x = 2