Multiply a number by 6, add 6, subtract 6, divide by 6, the result is still 6, what is the number?
一个数乘以6，加上6，减去6，除以6，结果还是6，这个数是多少．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">36 + 6</gadget>
<output>42</output>

<gadget id="calculator">42 - 6</gadget>
<output>36</output>

<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<result>6</result>