$$64m^{3}-343n^{3}.$$
$\left(4m-7n\right)\left(16m^{2}+28mn+49n^{2}\right)$
$$\left(4m-7n\right)\left(16m^{2}+28mn+49n^{2}\right)$$
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$64m^{3}-343n^{3}$
