5(2x – 4y) + 6(-10x – 15y)=10x-20y-60x-90y=10x-60x-20y-90y=-50x-110y
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5(2x – 4y) + 6(-10x – 15y)=10x-20y-60x-90y=10x-60x-20y-90y=-50x-110y