title: Swap two subtraction values
body: <p>Something I regularly do in Vim needs to go. I'll do a subtraction</p>
  
  <pre><code>var a = b - c;
  </code></pre>
  
  <p>run it and realize it should be</p>
  
  <pre><code>var a = c - b;
  </code></pre>
  
  <p>What's the most efficient way to spin two values around a minus sign in vim?</p>