8а³(2х-у)²-12а²(у-2х)³

помогите. прошу

8а³(2х-у)²-12а²(у-2х)³ = 8а³(у-2х)²-12а²(у-2х)³ =(у-2х)²(8а³-12а²(у-2х)) =4а^2(у-2х)²(2а-3(у-2х))=4а^2(у-2х)²(2а-3у+6х)