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Olina a economisit in pusculita de 5 ori cate 10 lei.A cumparat 2 creioane a cate 3 lei,3 caiete a 5 lei si un penar.i au mai ramas in pusculita 10 lei.Cat a costat penarul?

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[tex]5*10= 50 lei\\50-2*3-3*5-p=10\\50-6-15-p=10\\29-p=10\\p= 19 lei[/tex]

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