$\frac{x^2-9}{2x-4}$
$\left(x\:+\:4\right)\left(x\:-\:7\right)$
$-6+\left[8-\left(-3+5\right)\right]\cdot\left(+2\right)$
$\left(3a^{10}\right)^3$
$\frac{x^2}{x^3+27}$
$x\:+\:10\:\le15$
$\left(8+x^8\right)\frac{dy}{dx}=\frac{x^7}{y}$
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