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The school library bought 372 scientific and technological books, 90 fewer than literature and art books. How many literature books did you buy?

Solution: Let's buy X literature books.

3x-90=372

3x=462

X= 154 copies

Or:

(372+90) ÷ 3 = 462 ÷ 3 = 154 copies

A: I bought 154 literature books.

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