$xy^2=-10$
$3u+3u-2u$
$1-\left(-36\right)$
$14xy+10x+42y+30+14xy-12x+42y-36$
$\frac{6x}{-9x^3}$
$\left(x+y\right)\left(x-z^2\right)$
$\lim\:_{x\to\:\:4}\left(\frac{x^2-5x-14}{x^2-2x-8}\right)$
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