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(4b^2 + 2b - 9) + (8b + 6) - (7b^4 + 3b^2 + 5b)

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(4b^2 + 2b - 9) + (8b + 6) - (7b^4 + 3b^2 + 5b)

4b^2 + 2b - 9 +8b+ 6 - 7b^4 - 3b^2 - 5b

4b^2- 3b^2 +8b- 5b - 9+ 6 - 7b^4

b^2 +3b -3 - 7b^4