n class="identifier">b</span></code>. <code class="computeroutput"><span class="identifier">b</span>
                    <span class="special">==</span> <span class="identifier">a</span>
                    <span class="special">+</span> <span class="special">(</span><span class="identifier">b</span> <span class="special">-</span>
                    <span class="identifier">a</span><span class="special">)</span></code>.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
    