$-16+4\left(-2\right)$
$2x+23=-9$
$158\cdot8$
$\lim_{x\to4}\left(\frac{3\left(x-4\right)\sqrt{x+5}}{3-\sqrt{x+5}}\right)$
$\frac{dy}{dx}=-15x^2=8$
$\tan^2x+5=\sec^2x+4$
$\frac{9}{7}x\frac{16}{21}$
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