Sarah walked a total distance of 5 miles from her house to the park. Along the way, she stopped at a coffee shop that was 2.5 miles from her house. After reaching the park, she decided to walk back home but stopped at a bookstore that was 1.75 miles from the park. How many miles are between the coffee shop and the bookstore? Let's think step by step and output the final answer within \boxed{}.
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