Multiply a number by 5, add 2, then subtract 12, and finally multiply by 2 to get 60. What is the number?
一个数乘以5，再加上2，接着减去12，最后乘以2得60，这个数是多少．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">30 + 10</gadget>
<output>40</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<result>8</result>