$$\left. \begin{array} { l } { ( 2 a - 7 ) } \\ { 3 b ( 6 a + 9 ) } \end{array} \right.$$
$9b\left(2a-7\right)\left(2a+3\right)$
$$9b\left(2a-7\right)\left(2a+3\right)$$
$$-72ab+36ba^{2}-189b$$
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$2a-7,\ 9b\left(2a+3\right)$