$-\frac{2}{x^3}-\frac{3\left(\:3-2x\right)}{x^4}$
$\frac{dv}{dt}+5v=25$
$\left(a^2+6\right)\left(a^2-9\right)$
$\frac{4x-2}{2x-8}$
$\left(-20\right)\left(6\right)\left(-30\right)\left(-5\right)$
$\frac{dy}{dx}=\frac{1+x}{1-x}$
$\lim_{x\to2}\left(\frac{8x^3-1}{2x-1}\right)$
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