$20\le x-18$
$\frac{1}{2}p-\frac{2}{3}q\:\frac{3}{4}p-\frac{1}{2}q$
$1t-9+8-t$
$-5\left(7s+6\right)$
$x\:2\:\left(y\:2\:+x\:2\:\right)+y\:8$
$\frac{d}{dx}\cos\left(-5x+2\right)$
$10\csc\left(x\right)+10=0$
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