Question

помогите
y (a+b)-2 (b+a)
3x-3y+a (x-y)

Answer 1

y· (a+b)-2·(b+a)=(а+b)·(y-2)

3x-3y+a ·(x-y) =3·(x-y)+a ·(x-y) =(x-y)·(3+a)