span class="special">(</span><span class="number">3</span> <span class="special">+</span> <span class="number">4</span><span class="special">)</span>
<span class="special">(-</span><span class="number">1</span> <span class="special">+</span> <span class="number">2</span><span class="special">)</span> <span class="special">*</span> <span class="special">(</span><span class="number">3</span> <span class="special">+</span> <span class="special">-</span><span class="number">4</span><span class="special">)</span