4x^2 - y +(2y-5x^2) =
nastepnie tezn wynik pomnoz przez 3x.
4x^2 - y +(2y -5x^2) = 4x^2 -y +2y -5x^2 = -x^2 +y
3x * (-x^2 + y) = -3x^3 + 3xy
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4x^2 - y +(2y -5x^2) = 4x^2 -y +2y -5x^2 = -x^2 +y
3x * (-x^2 + y) = -3x^3 + 3xy