$\frac{x-1}{x^3+x}$
$\sqrt{81z^2}$
$x^2+3x+21=22$
$\left(2xy+5x^2\:y^2\right)^2$
$x^2-4x-3$
$x^2+4<0$
$\left(4^{18}\right)\left(4^6\right)$
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