Mathematics, 26.08.2019 08:10, ijohnh14

Matt gives half of his books to the local library and kept the other half. his best friend gives him 3 more books. he now has 57 books. how many did he have to start.
this is a algebra question haves to have a main first equation

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Matt gives half of his books to the local library and kept the other half. his best friend gives him...