$\frac{2x^2-3x}{2}-x$
$5x+2<2x-1$
$\lim_{y\to0}\left(\lim_{x\to0}\left(\frac{x-y}{x+y}\right)\right)$
$\frac{1}{2+4x^2}$
$\left(-\frac{1}{3}b+4\right)\left(-\frac{1}{3}b-25\right)$
$\left(-323\right)-\left(-839\right)$
$4\tan x-4=0$
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