The school shipped 1,200 science and technology books, 800 less than 2.5 times the number of literature and art books. How many literature and art books did the school ship? (column equation solution)
学校运来科技书1200本，比文艺书本数的2.5倍少800本，学校运来文艺书多少本？(列方程解答)
<gadget id="calculator">800 + 1_200</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 2.5</gadget>
<output>800</output>

<result>800</result>