$$\frac{9}{d-12}\cdot\frac{2d-16}{d-8}$$
$\frac{18}{d-12}$
$$\frac{9}{d-12}\times \frac{2\left(d-8\right)}{d-8}$$
$$\frac{9}{d-12}\times 2$$
$$\frac{9\times 2}{d-12}$$
$$\frac{18}{d-12}$$
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