Question
Gwen bought some cards. She gave 15 of the cards to her cousin and sold 34 of the remaining cards. After that, she bought another 304 cards and had the same number of cards that she bought at first. How many cards did Gwen buy at first?
4 m

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Gwen bought some cards. She gave 15 of the cards to her cousin and sold 34 of the remaining cards. After that, she bought another 304 cards and had the same number of cards that she bought at first. How many cards did Gwen buy at first?