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Example Equation

An equation: \(b = at\).

A displayed equation that is not numbered: $$b = at$$ A displayed equation that is numbered: \begin{align}\label{eq:continuity} \frac{\partial \rho}{\partial t} + \nablav \cdot (\rho\vec{u}) =0\,. \end{align} Equation \eqref{eq:continuity} is the continuity equation.