2x(1+x2+3x)+5x and 4(x2+3x-1) add:
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2x(1+x^2+3x)+5x + 4(x^2+3x-1)
= 2x + 2x^3 + 3x^2 + 5x + 4x^2 + 12x - 4
= 2x^3 + 7x^2 + 19x - 4 ——> Answer
= 2x + 2x^3 + 3x^2 + 5x + 4x^2 + 12x - 4
= 2x^3 + 7x^2 + 19x - 4 ——> Answer
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