There are 60 people in the fifth grade who borrow books from the library, among which 51 people borrow story books, 45 people borrow technology books, 8 people borrow neither kind of books, how many people borrow both kinds of books?
五年级有60人去图书馆借书，其中借故事书的有51人，借科技书的有45人，两种书都没借的有8人，两种书都借的有多少人？
<gadget id="calculator">60 - 8</gadget>
<output>52</output>

<gadget id="calculator">45 - 52</gadget>
<output>-7</output>

<gadget id="calculator">51 + (-7)</gadget>
<output>44</output>

<result>44</result>