title: writing negative numbers in racket
body: <p>2 – (-12/x) = -4 </p>
  
  <p>the negative 12 is what is confusing me. where do I put the negative sign?</p>
  
  <pre><code>(define (math x)
  ( = ( - ( / 12 x) 2) 4))
  </code></pre>