title: how assign values to variables in racket?
body: <p>if I have this list</p>
  
  <pre><code>'((x 3) (y 4) (z 2))
  </code></pre>
  
  <p>how do I assign 3 to x and y to 4 and z to 2 to use it to do math like?</p>
  
  <pre><code>3 + x
  </code></pre>
  
  <p>or</p>
  
  <pre><code>y + z
  </code></pre>
  
  <p>Thanks</p>