$6x-3=-39$
$\lim_{x\to5}\left(\frac{\sqrt{x-9}}{x-81}\right)$
$4^7\cdot4^{-5}$
$\frac{dx}{dc}=\frac{2.15}{2.4-80000\cdot c}$
$\int\frac{x-4}{\left(x+6\right)\left(x-1\right)}dx$
$4\sin^2x+2=5$
$\frac{dy}{dx}=\frac{x}{7\cos\left(y\right)}\:$
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