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= 5x^2 - 2x + 4 + 4x^3 - 9x^2 + 3 => operacion ( +5x^2 - 9x^2 = -4x^2)
= 4x^3 - 4x^2 - 2x + 4 + 3 => sumamos 4 + 3 = 7
= 4x^3 - 4x^2 - 2x + 7