title: Invert a bitwise left shift and OR assignment
body: <p>What would be the inverse function for this?</p>
  
  <pre><code>A = (B &lt;&lt; 3) | 0x07;
  </code></pre>
  
  <p>How can I get a <code>B</code> when I already have the corresponding <code>A</code>?</p>