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6.Sa se rezolve in Z ecuatille a)2x+3=7 b)9-2x=-31-7​

Răspuns :

Lasmina

a)2x+3=7=>2x=7-3=>2x=4=>x=2, x apartine Z

b)9-2x=-31-7=>9-2x=-38=>-2x=-38-9=>-2x=-47=>x=47/2, x nu apartine Z

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