From mboxrd@z Thu Jan  1 00:00:00 1970
From: Suvayu Ali <fatkasuvayu+linux@gmail.com>
Subject: Re: org-element
Date: Fri, 22 Feb 2013 14:14:37 +0100
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On Fri, Feb 22, 2013 at 11:38:16AM +0000, Achim Gratz wrote:
> 
> How is one supposed to write (longer) equations out on multiple lines (leaving
> the operators behind on the previous line obviously works, but is ugly)?

I use LaTeX blocks.  So your example would translate to:

#+begin_latex
  \begin{equation}
    r = a
    + b
    - c
  \end{equation}
#+begin_latex

With easy templates, entering blocks is trivial (<l for LaTeX blocks).

Hope this helps,

-- 
Suvayu

Open source is the future. It sets us free.