(1 - y) (3y - 4) - 3y = ?
3y-4-3y^2+4y-3y=3y^2+4y-4
(1 - y) (3y - 4) - 3y =
= 3y - 4 - 3y² + 4y - 3y =
= -3y²+4y -4
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3y-4-3y^2+4y-3y=3y^2+4y-4
(1 - y) (3y - 4) - 3y =
= 3y - 4 - 3y² + 4y - 3y =
= -3y²+4y -4