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MGSM / Charlie tenía 10 pegatinas. Compró 21 pegatinas en una tienda del centro…

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Charlie tenía 10 pegatinas. Compró 21 pegatinas en una tienda del centro comercial y le regalaron 23 pegatinas para su cumpleaños. Luego, Charlie le dio 9 de las pegatinas a su hermana y usó 28 para decorar una tarjeta de felicitación. ¿Cuántas pegatinas le quedan a Charlie?

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