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Cate elemente are multimea A= { x l x apartine N si 7x + 3 = x + 28 } ?

Răspuns :

A={ x I x apartine N si 7x+3=x+28}
A={ 7x+3=x+28}
A={7x-x=28-3}
A={6x=25}
A=multimea vida
Aceasta multime nu are solutie.