There are 56 students in class 41, 29 of them got the first question right, and 7 got the two questions right. How many people do the second question right?
四1班有学生56人，做对第一道思考题的有29人，两道思考题都做对的有7人．做对第二道思考题的有多少人？
<gadget id="calculator">7 - 29</gadget>
<output>-22</output>

<gadget id="calculator">56 + (-22)</gadget>
<output>34</output>

<result>34</result>