1) 3(x-5)-7(x-1)=3x-15-7x+7=-4x-8
2) 2(x-y)+2(2x-3y)=2x-2y+4x-6y=6x-8y
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Answers & Comments
1) 3(x-5)-7(x-1)=3x-15-7x+7=-4x-8
2) 2(x-y)+2(2x-3y)=2x-2y+4x-6y=6x-8y