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Dillon is starting a business selling handmade necklaces. He has decided to invest an initial amount of $45 for advertising, and materials cost $7 for each necklace he makes. Dillon can sell his creations for $12 per necklace. Once he makes and sells a certain number of necklaces, he will break even, with identical expenses and sales. What would the total expenses and sales be then? How many necklaces would that take?