\frac {dP}{dr} = \frac {-(P+\pho c^2) \nu'} {2} \tag { Oppenheimer \& Volkoff}

I need to get these in one line, please someone write me the exact code for this , i also have other equations before it, that i need to align with this line

the lines upper to this equation is

\begin{equation}

\left.

\begin{aligned}

KP &= e^{-\lambda} \Big( \frac {\nu'}{r}+ \frac {1}{r^2}\Big)-\frac {1}{r^2} \\

KP &= e^{-\lambda} \Big(\frac {\nu ''}{2}-\frac {\lambda ' \nu '}{4} + \frac {(\nu')^2}{4} + \frac {\nu' -\lambda'}{2r}\Big) \\

K \rho c^2 &= e^{-\lambda}\Big (\frac {\lambda '}{r}-\frac {1}{r^2}\Big) +\frac {1}{r^2}

\end{aligned}

\right\} \tag{Tolman 1939}

\end{equation}