title: Writing a simple equation parser
body: <p>What sorts of algorithms would be used to do this (as in, this is a string, and I want to find the answer):</p>
  
  <pre><code>((5 + (3 + (7 * 2))) - (8 * 9)) / 72
  </code></pre>
  
  <p>Say someone wrote that in, how could I deal with so many nested parenthesis? </p>