7.m(p+n)-k(p+n)=(p+n)(m-k)
8.-b(x-y)-c(y-x)=b(x+y)+c(x+y)=(b+c)(x+y).
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7.m(p+n)-k(p+n)=(p+n)(m-k)
8.-b(x-y)-c(y-x)=b(x+y)+c(x+y)=(b+c)(x+y).