If 9x=72, how big is the sum of 9x+12x?
如果9x=72，那么9x+12x的和大多少呢？
<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<gadget id="calculator">9 * 8</gadget>
<output>72</output>

<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">72 + 96</gadget>
<output>168</output>

<result>168</result>