x-y-z(y-x)=x-y-zy+zx
ab-ac+7c-7b=a(b-c)-7(b-c)=(a-7)(b-c)
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x-y-z(y-x)=x-y-zy+zx
ab-ac+7c-7b=a(b-c)-7(b-c)=(a-7)(b-c)