Add or subtract as indicated.(7a3b3 + 3a2b) + (9a3b3 + 5a2b) - (6a3b3 - 2a2b)

A. 20a5b
B. 10a3b3 + 10a2b
C. 20ab10
D. 10a6b3 + 10a4b


Answer: B

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