$$\left. \begin{array} { l } { 3 x - 9 } \\ { 12 a ^ { 2 } + 6 } \\ { x ^ { 2 } + 3 x ^ { 3 } } \end{array} \right.$$
$6\left(x-3\right)\left(3x+1\right)x^{2}\left(2a^{2}+1\right)$
$$3x-9=3\left(x-3\right)$$ $$12a^{2}+6=6\left(2a^{2}+1\right)$$ $$x^{2}+3x^{3}=\left(3x+1\right)x^{2}$$
$$6\left(x-3\right)\left(3x+1\right)x^{2}\left(2a^{2}+1\right)$$
$$36a^{2}x^{4}+18x^{4}-96a^{2}x^{3}-48x^{3}-36a^{2}x^{2}-18x^{2}$$
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$3x-9,\ 12a^{2}+6,\ 3x^{3}+x^{2}$
