5ab(6a^2−b^2)+6ab(b^2−5a^2)=30a^3b−5ab^3+6ab^3−30a^3b=ab^3=10*(-3)^3=10*-27=-270
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5ab(6a^2−b^2)+6ab(b^2−5a^2)=30a^3b−5ab^3+6ab^3−30a^3b=ab^3=10*(-3)^3=10*-27=-270