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(2h^3 + 9h^2 - 3) + (8h^2 - 6) - (5h^3 + 4h^2)

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(2h^3 + 9h^2 - 3) + (8h^2 - 6) - (5h^3 + 4h^2)

2h^3 + 9h^2 - 3 + 8h^2 - 6 - 5h^3 - 4h^2

2h^3- 5h^3 - 4h^2+ 9h^2+ 8h^2 - 6 - 3

- 3h^3 +139h^2 -9