8 times a number plus 4 is 7 times 4, what is this number?
一个数的8倍加4是4的7倍，这个数是多少？
<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<gadget id="calculator">28 - 4</gadget>
<output>24</output>

<gadget id="calculator">24 / 8</gadget>
<output>3</output>

<result>3</result>