find the sum of 5xcube+7+6x-5xsquare , 2xsquare-8-9x , 4x-2xsquare+3xcube , 3xcube-9x-xsquare
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add all the coefficients of xcube (x^3) term, then all terms of xsquare (x^2) term, then add the coefficient terms of x term and finally add the constant terms directly. There comes your answer. Hope it's helpful!!
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