There are 30 students in Class 51 participating in the reading group, which is 6 more than twice the number of participating in the calligraphy group. How many students are there in the calligraphy group? (First write out the equivalent relationship, and then list the equation solution)
五1班参加朗读小组的学生有30人，比参加书法小组的人数的2倍多6人，参加书法小组的学生有多少人？(先写出等量关系，再列方程解答)
<gadget id="calculator">30 - 6</gadget>
<output>24</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<result>12</result>