$$64 x ^ { 3 } + 343 y ^ { 3 }$$
$\left(4x+7y\right)\left(16x^{2}-28xy+49y^{2}\right)$
$$\left(4x+7y\right)\left(16x^{2}-28xy+49y^{2}\right)$$
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$64x^{3}+343y^{3}$
