(6ab^2+7ab^2+9ab^2+21ab^2 ) + (55a^3b^2 - 81a^3b2)
=43ab^2 -26a^3b^2
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(6ab^2+7ab^2+9ab^2+21ab^2 ) + (55a^3b^2 - 81a^3b2)
=43ab^2 -26a^3b^2