10 Simplify (8x^4 - 5x - 5x^2 + 8) - (7x^3 - 7x^2 + 7) +
(2x^3 - 7x^2 + 2x - 9).
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8x^4 - 5x - 5x^2 +8 - 7x^3 + 7x^2 - 7 + 2x^3 -7x^2 + 2x - 9 = 8x^4 -5x^3 -5x^2 -3x -8
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