Someone asked Sun Wukong how many flat peaches the Queen Mother ate. Sun Wukong said: "If the number of flat peaches I eat is increased by 3 times, and the number of flat peaches I eat is reduced by 3 times, the difference is the number of flat peaches I eat. "So, how many flat peaches did Sun Wukong eat?
有人问孙悟空偷吃了王母娘娘几只蟠桃．孙悟空说："如果用我吃的蟠桃只数再增加3只后的2倍，与我吃的蟠桃只数再减少了3只后的2倍的差，就是我吃的蟠桃的只数了．"那么，孙悟空吃了多少只蟠桃．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<gadget id="calculator">1 - 2</gadget>
<output>-1</output>

<gadget id="calculator">2 + (-1)</gadget>
<output>1</output>

<gadget id="calculator">12 / 1</gadget>
<output>12</output>

<result>12</result>