Answer:
(18b^2 + 9b^4) + (12b^3)
Explanation:
(7b^2 + 3b^4) + (2b^2 + 4b^3) + (8b^3 + 6b^4 + 9b^2)
(9b^2 + 3b^4) + (4b^3) + (8b^3 + 6b^4 + 9b^2)
(18b^2 + 3b^4) + (4b^3) + (8b^3 + 6b^4)
(18b^2 + 9b^4) + (4b^3) + (8b^3)
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