Teacher Li gave prizes to students with both good character and learning. If each person gave 2 pens, there would be 13 more pens; if each person gave 3 pens, there would be 13 less. How many students are there who are both excellent in character and learning? (solution by equation)
李老师给品学兼优的学生发奖品，如果每人发2支钢笔，多出13支；如果每人发3支钢笔又少了13支．问有多少个品学兼优的学生呢？(用方程解)
<gadget id="calculator">13 + 13</gadget>
<output>26</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">26 / 1</gadget>
<output>26</output>

<result>26</result>