Answer:
9x^(3)-3x+3
Explanation:
9x^3 - 3x + 3
(4x^3 + 3x + 1) - (-5x^3 + 6x - 2) =
= 4x^3 + 3x + 1 + 5x^3 - 6x + 2
= 9x^3 - 3x + 3
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