\begin{equation}
\displaylines{I = \int \rho R^{2} dV \\ Y = 1}
\end{equation}
or alternatively an align block, e.g:
$$
\begin{alignat}{2}
I & = \int \rho R^{2} dV & + P \\
Y & = 1 & + x
\end{alignat}
$$
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