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B. Neville and Luna go to a used book sale, where every book is the same price. Neville buys 5 books and Luna buys

B. Neville and Luna go to a used book sale, where every book is the same price. Neville buys 5 books and Luna buys 4 books. They run into their friend Hermione, who really loves to read, and discover that she has bought 19 books. Hermione received a $10 discount, but she still spent $5 more than Neville and Luna combined. How much does one book cost?

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