Add 6 to a number, subtract 2, and divide by 5 to get 7. What is the number?
一个数加上6，减去2，然后除以5得7，则这个数是多少
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">2 - 6</gadget>
<output>-4</output>

<gadget id="calculator">35 + (-4)</gadget>
<output>31</output>

<result>31</result>