$$(-81 { y }^{ 2 } +64) \div (8-9y)$$
$9y+8$
$$\frac{\left(-9y-8\right)\left(9y-8\right)}{-9y+8}$$
$$\frac{-\left(-9y-8\right)\left(-9y+8\right)}{-9y+8}$$
$$-\left(-9y-8\right)$$
$$9y+8$$
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