2(a-b)+a(a-b)= 7(x+y)-a(x+y)= 2(a-b)+c(b-a)= 2a(b-3)-5c(3-b)= (m+1)-m(m+1)= x(y-z)²+(z-y)²= 4(m+n)+(m+n)= 2(x-y)-a(x-y)=

2(a-b)+a(a-b)=(2+a)(a-b)
7(x+y)-a(x+y)=(7-a)(x+y)
2(a-b)+c(b-a)=(2-c)(a-b)
2a(b-3)-5c(3-b)=(2a+5c)(b-3)
(m+1)-m(m+1)=(1-m)(m+1)=1²-m²
x(y-z)²+(z-y)²=(x-1)(y-z)²
4(m+n)+(m+n)=5(m+n)
2(x-y)-a(x-y)=(2-a)(x-y)