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Mathematics, 10.10.2020 23:01 nicjeyr

Jessica has 45 books in her library. She bought several books at yard sale over the weekend. She now has 78 books in her library. How many books did she buy at the end of the yard sale? x+45=78; 33 books
x-45=78; 33 books
x-78=33; 111 books
x+45=33; 37 books

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