$38-\left(-4\right)$
$x^2y^08$
$\left(xy+yz-z\right)^2$
$12x^2+17x-5$
$-2\left(x+4y\right)\left(2x-3y\right)$
$r^2+r-20$
$\lim_{x\to0}\left(\frac{\sqrt{3x+16}}{x}\right)$
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