a) (m-n+p)a - (m-n+p)bb) (a-b)x - (a-b)y - cxc) (1+a-c)x^2 - (1+a-c)y - ayd) (a+2)x^2 - (b+2)x + (a-2)y
a) (m-n+p)a - (m-n+p)b
b) (a-b)x - (a-b)y - cx
c) (1+a-c)x^2 - (1+a-c)y - ay
d) (a+2)x^2 - (b+2)x + (a-2)y