$3r\left(3m-4n+r\right)-2t\left(3m-4n+r\right)$
$\lim_{x\to3}\left(\frac{2x-1}{9-3x}\right)$
$\frac{\left(6x^5z^3\right)}{4x^4z^2}$
$\frac{x^2}{12}\:-\:\frac{5}{3}\:x\:+\:\frac{24}{3}$
$\lim_{x\to0}\left(\frac{n^2}{e^n}\right)$
$pv-pb+av-ab$
$22x^2+12x^4+8xy$
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