Gabrielle sells eggs. On Monday she sells 5 crates of eggs. On Tuesday she sells 2 times as many crates of eggs as Monday. On Wednesday she sells 2 fewer crates than Tuesday. On Thursday she sells half as many crates of eggs as she sells on Tuesday. How many total crates of eggs does she sell for the 4 days?
Please reason step by step, and put your final answer within \boxed{}.
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