Explanation

Let x = number of books on the small shelf, and x 8 = number of books on the large shelf. Then, 4x = number of books on 4 small shelves, and 3(x+8) = number of books on 3 large shelves.

4x + 3(x + 8) = 297

4x + 3x + 24 = 297

7x + 24 = 297

7x = 297 − 24

\(7 x=273 \div 7=39\)

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