Question
Shiyun bought some stamps. She gave 15 of the stamps to her brother and sold 27 of the remaining stamps. After that, she bought another 270 stamps and had the same number of stamps that she bought at first. How many stamps did Shiyun buy at first?
4 m

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Shiyun bought some stamps. She gave 15 of the stamps to her brother and sold 27 of the remaining stamps. After that, she bought another 270 stamps and had the same number of stamps that she bought at first. How many stamps did Shiyun buy at first?