$-2+3\cdot4-5\cdot3$
$\frac{dy}{dx}=-y^2+36$
$\lim_{x\to1}\left(\frac{x^2-5x-6}{x+1}\right)$
$\frac{1}{x}<2$
$-39\:\cdot\:7$
$\sqrt{x+5}+\sqrt{x}=5$
$-10+3-\left(-8\right)+4-3$
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