The school spring outing rented several boats for the students to row. If each boat takes 3 people, there will be an extra boat. If each boat takes 5 people, there will be 19 seats left. How many students participate in rowing? (solution by equation)
学校春游租了几条船让同学们划，如果每条船坐3人，则多出一条船，如果每条船坐5人，则空出19人的位置，有多少学生参加划船？(用方程解)
<gadget id="calculator">19 - 3</gadget>
<output>16</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">3 * 8</gadget>
<output>24</output>

<gadget id="calculator">24 - 3</gadget>
<output>21</output>

<result>21</result>