Answers to 13.15 Punchline algebra book b? - Answers

In the context of a math textbook like Punchline Algebra, "13.15" likely refers to a specific problem or exercise within the book. The term "Punchline" may indicate that the problem has a clever or humorous solution. Without further context or the specific content of problem 13.15, it is difficult to provide a precise answer. To solve this problem, you would typically follow the algebraic steps outlined in the book, which could involve simplifying expressions, solving equations, or manipulating variables.