$$3 { X }^{ 3 } -1- { X }^{ 2 } +3X$$
$\left(3X-1\right)\left(X^{2}+1\right)$
$$X^{2}\left(3X-1\right)+3X-1$$
$$\left(3X-1\right)\left(X^{2}+1\right)$$
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