Answer
$6ab(2a^2-1+3b-3a)$
Work Step by Step
Factoring the $GCF=
6ab
$, then,
\begin{align*}
12a^3b-6ab+18ab^2-18a^2b
\Rightarrow
6ab(2a^2-1+3b-3a)
.\end{align*}
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