Elimine os parenteses deste polinômios e reduza os termos semelhantes
a) (2y²-7y+9)-(8y²-10y+7-(y²+4)
b) (9x³-13x²-2x+8)-(5x³-3x²+7x)
a) (2y²-7y+9)-(8y²-10y+7-(y²+4)
b) (9x³-13x²-2x+8)-(5x³-3x²+7x)
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