$\frac{d}{dx}-\frac{1}{20}t+a$
$sin\left(tan^{-1}\left(x\right)\right)$
$t^2\:+\:20r\:+\:10r$
$\left(x^2+1\right)\left(12x^2-2\right)$
$\frac{x-2}{x-3}-\frac{x-3}{x-4}$
$7\left(2\:+\:3x\right)\:\le\:5\left(6x\:+\:3\right)$
$z^2+2z-143=0$
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