There are 28 people in class 3 and 2, 13 people ordered comic books, 14 people ordered story books, 6 people ordered both books, and how many people ordered neither book?
三2班有28人，其中订漫画书的有13人，订故事书的有14人，两种书都订的有6人，两种书都没订的有多少人？
<gadget id="calculator">13 + 14</gadget>
<output>27</output>

<gadget id="calculator">27 - 6</gadget>
<output>21</output>

<gadget id="calculator">28 - 21</gadget>
<output>7</output>

<result>7</result>