$x^2+x-72<0$
$100x^2\:-\:256y^2$
$-5-1+6-8-3-7$
$\frac{d}{dx}e^{-\frac{7}{x}}$
$\frac{dy}{dx}\left(5^{x^2-x}\right)$
$4x^2-11x=.7$
$\left(4.20\right)\left(4.22\right)$
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