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Sam is selling used books online. The first book the customer buys is $8.00, the second-third book are $7.00 each, the fourth and all other books, b, are $5.00. A buyer has $35 to spend, before tax and shipping. Write an inequality to show how many books this customer may buy before the applicable taxes and shipping charges.

User Tin
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8+7+7+5b is less than or equal to 35
User Edouard Berthe
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