X-y-z(y-x) ab-ac+7c-7b Решите пж

Question

X-y-z(y-x)
ab-ac+7c-7b
Решите пж

Answer 1

x-y-z(y-x)=x-y-zy+zx

ab-ac+7c-7b=a(b-c)-7(b-c)=(a-7)(b-c)