$$7 { m }^{ 2 } -14n+2 { m }^{ 3 } -4mn$$
$\left(2m+7\right)\left(m^{2}-2n\right)$
$$7\left(m^{2}-2n\right)+2m\left(m^{2}-2n\right)$$
$$\left(m^{2}-2n\right)\left(7+2m\right)$$
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