title: how do I break an equation when there is \left and \right involved?
body: <p>I am using an align environment, and at some point I am interested in breaking an equation to the next line. The problem is that this equation includes a <code>\left</code> and <code>\right</code>, so when I try to break it using <code>\\</code>, I get an error. Any ideas?</p>
  
  <p>For example, the following wouldn't compile:</p>
  
  <pre><code>\begin{align}
  \left(4+5+6+ \\
  4 + 6 +2 \right)
  \end{align}
  </code></pre>
  
  <p>Thanks.</p>