$\frac{x^2-1}{x^3}-\frac{2x}{x^2+7}$
$\int\frac{1}{\sqrt{9e^{-2x}-1}}dx$
$-1\cdot\left(-1\right)^2$
$7x+7y$
$6z-11\ge7$
$\frac{z+10}{z^2\left(z-1\right)}$
$\frac{6x^2-10x-24}{2x-3}$
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