There are 126 books on shelf A. If 26 books are taken from shelf A and put into shelf B, then the number of books on the two shelves is exactly equal. How many books are there on shelf B?
甲书架有书126本，如果从甲书架取出26本放入乙书架，那么两个书架的本数正好相等，乙书架原来有书多少本？
<gadget id="calculator">26 * 2</gadget>
<output>52</output>

<gadget id="calculator">126 - 52</gadget>
<output>74</output>

<result>74</result>