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MGSM / Charlie had 10 stickers. He bought 21 stickers from a store in the mall and got…

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Charlie had 10 stickers. He bought 21 stickers from a store in the mall and got 23 stickers for his birthday. Then Charlie gave 9 of the stickers to his sister and used 28 to decorate a greeting card. How many stickers does Charlie have left?

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