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

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

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

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

4 + 7b^4 - 3b^2 -5b^3