In LaTeX one can use the eqnarray environment to display a set of equations aligned horizontally on their equality signs or other element, e.g.:

\begin{eqnarray*}
  x &=& 5! \\
    &=& 5 \cdot 4 \cdot 3 \cdot 2 \cdot 1
\end{eqnarray*}

This will render as follows (notice the alignment of the equality signs):

http://imgur.com/TxH0Y.png

(Sorry, I don't have any reputation here yet so I'm not allowed to inline the image.)

Is there a good way to achieve the same effect in Microsoft Word 2007's built in equation editor?