$\frac{1}{b^2}-9a^2$
$m\:5\:+\:m$
$15-m=22-8m$
$\lim_{x\to1}\left(\frac{2-\sqrt{x+3}}{\sqrt[3]{x+7}-2}\right)$
$\frac{8^7}{8^7}$
$e^y=0$
$\frac{e^{2x^2}}{e^{2x^2}}$
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