$$a \frac { 9 - 9 x } { 2 x ^ { 2 } + 7 x - 4 }$$
$\frac{9a\left(1-x\right)}{\left(2x-1\right)\left(x+4\right)}$
$$\frac{a\left(9-9x\right)}{2x^{2}+7x-4}$$
$$\frac{9a-9ax}{2x^{2}+7x-4}$$
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$-\frac{9\left(ax-a\right)}{2x^{2}+7x-4}$
