$\frac{d}{dx}\left(\frac{x^2y^2+xy+1}{2x^2y}\right)$
$x^2-9x-22$
$3x-28<8$
$y'+3y=21$
$\left(x^3-7x-6\right)\left(x+1\right)$
$e\frac{3}{\infty}-1$
$\left(-5+6\right)^2+\left(-5-2\right)^2$
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