$$\left. \begin{array} { l } { 9 ( x - 1 ) ^ { 2 } - 4 ( 2 x + 3 ) ^ { 2 } } \\ { 2 x - 5 - x } \end{array} \right.$$
$\left(x-5\right)\left(x+9\right)\left(7x+3\right)$
$$\left(x-5\right)\left(x+9\right)\left(7x+3\right)$$
$$7x^{3}+31x^{2}-303x-135$$
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$-\left(x+9\right)\left(7x+3\right),\ x-5$
