$22.5-13.81$
$-\frac{2}{3}\left(-3\:-9x\right)$
$\left(3-8\right)+\left\{5-\left(-2\right)\right\}$
$9.24\cdot0.25$
$\lim_{x\to0}\left(\frac{7x}{\sqrt{x^2+4}}\right)$
$\frac{dy}{dx}=\frac{sin3x}{cos4y}$
$\frac{1}{x+8}\le\frac{1}{x-16}$
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