Bookstores A and B have the same number of books. Bookstore A sells 3,000 books, and bookstore B buys 2,000. At this time, the number of books stored in bookstore B is twice that of A. How many books are there in both bookstores? ?
甲、乙两个书店存书册数相等，甲书店售出3000册，乙书店购入2000册，这时乙书店存书的册数是甲的2倍，甲、乙两书店原来共存书多少册？
<gadget id="calculator">2 * 3_000</gadget>
<output>6_000</output>

<gadget id="calculator">6_000 + 2_000</gadget>
<output>8_000</output>

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

<gadget id="calculator">8_000 / 1</gadget>
<output>8_000</output>

<gadget id="calculator">8_000 + 8_000</gadget>
<output>16_000</output>

<result>16_000</result>