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How many books does a math interest group in the school library give?
Solution:

(1) suppose there are x people in a math interest group.

According to the meaning of the question, formulas can be listed.

5x+3=7x-5

x=4

② Total number of books

5×4+3=23 (Ben)

A: There are 4 people in the first math interest group, and there are 23 books in the first book. ..