wyłącz wspólny czynnik poza nawias
(2y-6)y-2(y-3)y²
(2y-6)y-2(y-3)y²= 2y²-6y(-2y+3)y²=2y²-6y-2y^3+3y²=5y²-2y^3-6y=y(5y-2y²-6)
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(2y-6)y-2(y-3)y²= 2y²-6y(-2y+3)y²=2y²-6y-2y^3+3y²=5y²-2y^3-6y=y(5y-2y²-6)