First subtract 4 from a number, then multiply the difference by 4 times, add 4 to reduce the result by 4 times, and get 8.8. What is this number?
一个数先减去4，再将差扩大4倍，再加4，将结果缩小4倍，得8.8，这个数是多少．
<gadget id="calculator">8.8 * 4</gadget>
<output>35.2</output>

<gadget id="calculator">35.2 - 4</gadget>
<output>31.2</output>

<gadget id="calculator">31.2 / 4</gadget>
<output>7.8</output>

<gadget id="calculator">7.8 + 4</gadget>
<output>11.8</output>

<result>11.8</result>