$\frac{dy}{dx}=-y+e^{-x}$
$\frac{x^4}{16}+\frac{1}{2}+\frac{1}{x^4}$
$\frac{x}{2}+7\le-12$
$\frac{56}{4}$
$\frac{x^4+3x^2-18-2}{x-2}$
$-4\left(23\:-14\:\right)\:+\:2\left[\:5\left(24\:+\:14\:-35\right)+42\right]-65$
$\lim_{x\to0}\left(1+2sinx\right)^{\frac{2}{x}}$
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