Sarah is organizing books in a library. She has a total of 320 books to organize and wants to divide them equally across 7 shelves. After organizing the books, she realizes that she can only fit half of what she initially planned on each shelf due to space constraints. How many books will Sarah need to move to fit into the available space on the shelves, and how many will be left over? Let's think step by step and output the final answer within \boxed{}.
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