\hfill doesn't seem to work in the align environment. Can something else do the job? (I'd like to stick to the align environment if possible).
For example,
\begin{align*}
&longequation1\\
&=longequation2\\
&=longerequat-\\
&\hfill -ion3
\end{align*}
If I do this, the last line is not flushed right. \hfill is just ignored. The only thing I could think of is a bunch of \indent\indent\indent...\indent

I would appreciate your help!
John