There are 548 books in the school library, 296 books were purchased in the morning, and 455 books were borrowed by students in the afternoon. How many books are left in the school library?
学校图书室有图书548本，上午又购进了296本，下午学生借走了455本，学校图书室还剩下图书多少本？
<gadget id="calculator">296 - 455</gadget>
<output>-159</output>

<gadget id="calculator">548 + (-159)</gadget>
<output>389</output>

<result>389</result>