$\left(\frac{-7x^{-2}y}{xy^{-2}}\right)^3$
$\left(\frac{2x}{3}-6\right)^2$
$\frac{d}{dx}y^{-2}$
$\left(\sqrt{5}+\sqrt{-3}\right)\left(\sqrt{5}+2\sqrt{-3}\right)$
$\:9z+2z$
$2x-1\ge-x-3$
$\frac{x}{x}\ge2$
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