Last year, the school library had a total of x books. Over the summer, the library acquired another 42 books and now has a total of 2,402 books. Which equation could be used to find x, the number of books the library had last year?
A. 2,402 + x = 42
B. x + 42 = 2,402
C. 42x = 2,402
D. x - 42 = 2,402
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