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ajutoor!! fie multimea: A= {x€z | 7supra 2x+1 €z}...aflati A (€= apartine) p.s dau coroana

Răspuns :

7/(2x+1)€Z; 2x+1|7=>2x+1€D7; 2x+1€{1,7}|-1; 2x€{0,6}; x€{0,3}.