$$12mm-23mn-5mn$$
$4m\left(3m-7n\right)$
$$12m^{2}-23mn-5mn$$
$$12m^{2}-28mn$$
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$$m\left(12m-23n-5n\right)$$
$$12m-28n$$
$$4\left(3m-7n\right)$$
$$4m\left(3m-7n\right)$$
