$$\left. \begin{array} { l } { ( 2 x + 1 ) ^ { 3 } } \\ { ( 7 - 2 x ) ^ { 3 } } \end{array} \right.$$
$\left(\left(2x-7\right)\left(2x+1\right)\right)^{3}$
$$\left(2x-7\right)^{3}\left(2x+1\right)^{3}$$
$$64x^{6}-576x^{5}+1392x^{4}+288x^{3}-2436x^{2}-1764x-343$$
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$\left(2x+1\right)^{3},\ \left(7-2x\right)^{3}$
