Answer
$$2ab^2+4b-a$$
Work Step by Step
We divide the two terms by cancelling out common factors. Doing this, we obtain:
$$ \frac{6a^2b^3+12ab^2-3a^2b}{3ab}\\ \frac{3ba\left(2ab^2+4b-a\right)}{3ab}\\ 2ab^2+4b-a$$
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