Calculation: 72/((12+24)/9).
计算：72/((12+24)/9)．
<gadget id="calculator">12 + 24</gadget>
<output>36</output>

<gadget id="calculator">36 / 9</gadget>
<output>4</output>

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>