$9-\left(9-7\right)$
$8b^2+2b-15$
$15x+10-8x-9$
$10y^2-13y-3$
$\frac{dy}{dx}\left(y=x\sqrt{x^2+13}\right)$
$\left(xy-9\right)\left(xy-8\right)$
$\frac{x^2+10x+24}{x+6}$
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