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2015-05-06T19:29:22+08:00

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Whenever he borrows a book the number is positive while when he returns it the number is negative.
During the days the number of books he gave/returned:
Monday: 5
Wednesday: -3
Friday: 5

We add the values:
5+(-3)+5=5-3+5=2+5=7

Therefore the student has 7 books
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