The extracurricular reading group of Class 5A of Xiangyang Primary School bought some story books. If each person gets 4 books, then there will be 7 more books; if each person gets 6 books, then 9 books will be lost. How much do you charge for buying stories?
向阳小学五A班课外阅读小组买来一些故事书，若每人分4本，则多7本，若每人分6本，则少9本．买来故事收多少本？
<gadget id="calculator">7 + 9</gadget>
<output>16</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

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

<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<gadget id="calculator">32 + 7</gadget>
<output>39</output>

<result>39</result>