How about the attached using the multline environment?
> Andre Poenitz wrote:
>> Exact alignment is out-of-scope for TeX math as math always has
>> 'unbounded width'. So you have to fake it by something like
>>
>> $Right hand side of equation in words$ \\
>> \hfill$LHS of equation in words$
>>
>> [Not tested. Idea is to produce the 'flushright' outside math mode]
>
> I hate to sound pathetic, but it doesn't work. LaTeX file attached.
\documentclass{amsart}
\begin{document}
Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
\begin{multline}
\textrm{Right hand side of equation}=\\
\textrm{Left hand side of equation}
\end{multline}
Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah
\end{document}
