There are 26 students in the third grade of the Central Primary School, 14 people participated in the Chinese interest group, and 20 people participated in the mathematics interest group. How many people participated in both the Chinese interest group and the mathematics interest group?
中心小学三年级一共有26人，参加语文兴趣小组的有14人，参加数学兴趣小组的有20人，那么既参加语文兴趣小组又参加数学兴趣小组的多少人．
<gadget id="calculator">20 - 26</gadget>
<output>-6</output>

<gadget id="calculator">14 + (-6)</gadget>
<output>8</output>

<result>8</result>