Hi all, I wish ...
\[\begin{eqnarray} y & = & \frac{\ln\left( \frac{x}{m} - sa \right)}{r^2} \\ yr^2 & = & \ln\left( \frac{x}{m} - sa\right) \\ e^{yr^2} & = & \frac{x}{m} - sa \\ me^{yr^2} & = & x - msa \\ me^{rry} & = & x - mas \\ \end{eqnarray}\]
... to the whole PhysicsOverflow community ;-) !