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I bought a new batch of books in a primary school library, and the numbers attached to the books ranged from 426 to 70 1. How many new books did the library buy?
70 1-426=275 (Ben) A library bought 275 new books (elementary school algorithm).

Suppose: a library bought X new books.

X+426=70 1

X=70 1-426

X=275 (Ben)

The library bought 275 new books.

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