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Daca x e N si 3x minus 1e {2,5,8,14} atunci x este

Răspuns :

daca 3*x-1 e{2,5,8,14}  => 3*x e{3,6,9,15} => x e{3:3 , 6:3, 9:3,15:3} =>
=> x e{1,2,3,5}
3x-1={ 2,5,8,14}/+1=> 3x={3,6,9,15}/ :3=> X={1,2,3,5}