m-n+p(m-n)=(m-n)(1+p)
x+2a(x-y)-y=(x-y)+2a(x-y)=(x-y)(1+2a)
(a-b)²+a-b=(a-b)(a-b)+(a-b)=(a-b)(a-b+1)
4q(p-1)+(p-1)²=4q(p-1)+(p-1)(p-1)=(p-1)(4q+p-1)
1) (m-n)*(1+p)
2) (x-y)*(1+2a)
3) (a-b)*(a-b+1)
4) (p-1)*(4q+p-1)
