$$2 { m }^{ 2 } +4m-6 { m }^{ 2 } n$$
$2m\left(2+m-3mn\right)$
$$2\left(m^{2}+2m-3m^{2}n\right)$$
$$m\left(m+2-3mn\right)$$
$$2m\left(m+2-3mn\right)$$
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