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Hai ngăn sách có tất cả 84 quyển. Nếu lấy 4 quyển sách của ngăn thứ nhất chuyển sang ngăn thứ 2 thì số sách ở 2 ngăn bằng nhau. Hỏi mỗi ngăn có bao nhiêu quyển sách? Giúp mk vs ạ
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