$\frac{d}{dx}\left(\frac{2}{x-2}\right)$
$x-49.50=5.5$
$\left|30+40-60\right|$
$12=2\left(z-6\right)$
$6-9z$
$4y^2+12y-4$
$\left(3aq^4-2bs^5\right)\left(3aq^4+2bs^5\right)$
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