add (-10a^3b+12a^2b^2-6ab^3and 5ab^3-13a^2b+6a^2b^2
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-10a^3b + 0a^2b + 12a^2b^2 - 6ab^3
+ 0a^3b - 13a^2b + 6a^2b^2 + 5ab^3
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- 10a^3b - 13a^2b + 18a^2b^2 - ab^3
(answer)
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