How do I write the following word problem algebraically so that it can be solved in as a system of equations?
Dan is looking to secure a hard-copy textbook for an upcoming geology course that lasts six months. Dan is trying to decide between renting the text book and buying it. He can rent the textbook for $15 per month or purchase it outright for $105. Which option is the most advantageous for the student based upon the student's needs?

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Systems of equations is not needed to solve this.

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