solution to overflowing equation?

Question

What is the best solution for an equation which is overflowing?

I have the structure:

\begin{align}
long here & long here 2
\end{align}

and this causes the long here 2 to overflow.

I want to put it in the line below, shifted almost all the way to the left. One way to do it might be:

\begin{align}
\lefteqn{long here} & \\
& long here 2
\end{align}

but I thought there might be a way that wouldn't require lefteqn. is it so? (by the way, is lefteqn a no-no like eqnarray?)

Answer 1

What you want is the multline environment (from amsmath):

\begin{multline}
long left \\
long right
\end{multline}

The mathtools package provides also multlined that is to multline as aligned and gathered are to align and gather.