Mariana is starting a business selling handmade necklaces. She has decided to invest an initial amount of $78 for advertising, and materials cost $6 for each necklace she makes. Mariana can sell her creations for $9 per necklace. Once she makes and sells a certain number of necklaces, she will break even, with identical expenses and sales. What would the total expenses and sales be then? How many necklaces would that take?