$\lim_{x\to20}\left(\frac{4x-20}{x-20}\right)$
$2+3b_{-a-2b}$
$\left(x\:-\:16\right)^2\:$
$\pi\int_0^4\left(-\sqrt{y}+2\right)^2dy$
$\left(2\right)\left(-2\right)\left(-2\right)\left(3\right)$
$x^5\frac{dy}{dx}=y$
$t^2+2t-43=0$
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