$4x^2-36x=0$
$\frac{b}{b^{-7}}$
$\frac{12}{4}.\frac{2}{3}$
$\lim_{x\to0}\frac{\left(\sqrt{x+7}-3\right)}{x}$
$\lim_{x\to4}\left(2x^2-7x-4\right)$
$\frac{dx}{dt}=\frac{x^2}{2+x^2}$
$3\int ydy$
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