Test^2

Consider, $$\begin{equation}\label{eq:gravt} F=G\frac{mM}{r^2} \end{equation}$$ and, $$\begin{equation}\label{eq:gravo} F=mg \end{equation}$$ Combining ($\ref{eq:gravt}$) and ($\ref{eq:gravo}$) yield, $$g=G\frac{M}{r^2}$$