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= 8y² - 14y - 15
(4y-2)4 = 16y - 8
= 128y³-64y²+96y²-48y-320y²+160y-240y+120
= 128y³-64y²+96y²-320y²-48y+160y-240y+120
= 128y³-288y²-128y+120