subtract the sum of (4x ^ 3 + 2x ^ 2 - 5) and (15x - x ^ 3 - x ^ 2) from the sum of (9 + 6x - 2x ^ 2)and (4x - 1 - 5x ^ 3 + x ^ 2)
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The ans of this question is 8x ^3 +2x ^2+5x-13
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