$$2 { x }^{ 5 } -8 { x }^{ 4 } +3x-12$$
$\left(x-4\right)\left(2x^{4}+3\right)$
$$2x^{4}\left(x-4\right)+3\left(x-4\right)$$
$$\left(x-4\right)\left(2x^{4}+3\right)$$
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