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Hai thùng đựng 12000 lít dầu. Nếu chuyển 5000 lít dầu từ thùng thứ nhất sang thùng thứ hai thì số dầu ở thùng thứ hai gấp 5 lần số dầu ở thùng thứ nhất. Tìm số lít dầu ban đầu của mỗi thùng.
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