title: Aligning equations using Mathjax
body: <p>I'm trying to align equations underneath each other by the equator like this:</p>
  
  <pre><code>3x-1=-10
    3x=-9
     x=-3
  </code></pre>
  
  <p>But I'm not sure how. This is what I have:</p>
  
  <pre><code>`3x-1=-10 "&lt;br&gt;" 3x=-9 "&lt;br&gt;" x=-3`
  </code></pre>