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Mathematics, 19.12.2019 08:31 laylay2380

Abc bookstore sells one customer 12 used books and 4 new books for $120.
another customer buys 14 used books and 2 new books for $100. how much
is one used book (u), and one new book (n)?

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Abc bookstore sells one customer 12 used books and 4 new books for $120.
another customer buys...
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