665 б) г) Е) з) решите срочно пж

=(7х-7у)+(бх-бу)=7(х-у)+б(х-у)=(х-у)(7+б)
$$$$$$$$
=(pq+q)-(x+px)=q(p+1)-x(1+p)=(p+1)(q-x)
$$$$$$$$
=(2cx-cy)-(6x-3y)=c(2x-y)-3(2x-y)=(2x-y)(c-3)
$$$$$$$$$
=(56pq+8p)-(1+7q)=8p(7q+1)-1(1+7q)=
=(7q+1)(8p-1)