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5x-6y = -9xy
2x+7y= -13xy
masing2 dikalikan 5(untuk atas) dan 2(untuk bawah)
↔hasilnya = 10x-30y = -45xy
10x-14y = -26xy
dikurangi
↔hasilnya = -16y = -19xy
-19xy ÷ -16y = 19/16 x