There are 10 questions in a math test, 5 points are awarded for each correct answer, 2 points are deducted for each wrong answer, Xiaoli completed all 10 questions, and received a total of 29 points, how many questions did he get right?
一次数学测验共10道题，每做对一题得5分，每做错一题扣2分，小利完成了全部10道题，共得29分，他做对了多少题．
<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">50 - 29</gadget>
<output>21</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">21 / 7</gadget>
<output>3</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<result>7</result>