emily had some books she she traded 12 for magazines and ended up with 7 magazines and 3 books . what were each of the books worth to where she got 7 magazines and 3 books?
12 magazines = 7 magazines + 3 books -subtract 7 magazines from each side.
5 magazines = 3 books -divide each side by 3 to get the variable "books" but itself.
1 book = 5/3 maga
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