$\lim_{x\to\infty}\left(\frac{9x-8}{6+2\sqrt{x}}\right)$
$xy-x+y-1$
$\int x^3e^{-t^2}dx$
$\frac{dy}{dx}=\frac{2x}{y^2}$
$z^2-z-12$
$4\frac{1}{2}\:plus\:5\frac{1}{2}$
$\frac{2x}{x-3}-\frac{x-3}{x-3}=4$
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