$-7+\left(5-\left(3-5-8\right)\right)$
$\int_0^a\left(e^{-xy}\right)dx$
$+\:2\:-\:7\:+\:4\:+\:5$
$\sqrt{28w}+\sqrt{63w}$
$\lim_{x\to2}\left(\frac{x^2-2x}{x^2-2}\right)$
$186-u\ge191$
$20\sin\left(\frac{26.4}{5}\pi\right)-3$
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