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4x - 5y = -34 ( dikali 3 )
12x + 16y = -40
12x - 15y = 102
(dikurangi)
31y = -142
y = - 4,5
12x - 72 = -40
x =2,6
8(2,6) + 3 (-4,5) = 20,8-13,5 =7,3