$$\left. \begin{array} { l } { ( 3 n - 4 ) ( 4 x + 1 ) } \\ { 2 n x + 3 n - 16 - 4 } \end{array} \right.$$
$\left(3n-4\right)\left(4x+1\right)\left(2nx+3n-20\right)$
$$\left(3n-4\right)\left(4x+1\right)\left(2nx+3n-20\right)$$
$$24n^{2}x^{2}-32nx^{2}+42xn^{2}-296nx+320x+9n^{2}-72n+80$$
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$\left(3n-4\right)\left(4x+1\right),\ 2nx+3n-20$