To determine the answer to 7.19 in the Punchline Algebra book A, you would need to refer to the specific content of that exercise in the book. Each exercise in the Punchline Algebra series is unique and requires solving equations or performing operations based on the given context. Without the specific details of exercise 7.19, it is not possible to provide a definitive answer. I recommend reviewing the instructions and examples provided in the book to accurately solve this problem.
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