n>
  (<span class="mdzsyn-coresym">+=</span> <span class="mdzsyn-symbol">accum</span> (<span class="mdzsyn-coresym">-</span> (<span class="mdzsyn-coresym">*</span> <span class="mdzsyn-number">2</span> <span class="mdzsyn-symbol">x</span>) <span class="mdzsyn-symbol">x</span>)))
 <span class="mdzsyn-symbol">accum</span>)

(<span class="mdzsyn-symbol">my-adder</span> <span class="mdzsyn-number">1</span> <span class="mdzsyn-number">2</span> <span class="mdzsyn-number">3</span>) <span class="mdzsyn-comment"># -