$\infty-\frac{6}{5}$
$\frac{1}{x-3}-\frac{1}{6}<0$
$\frac{\left(\frac{2}{5}\right)}{\left(\frac{5}{2}\right)\left(\frac{5}{2}\right)}^{-2}$
$\frac{d^2x}{dt^2}=-2$
$4x^{5\:}y-20x^4yz-24x^3y^3+28x^3yz$
$a^2-4a-5$
$\frac{x^3y^{-2}}{z^2}$
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