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A={x|x ε N si 3 ori x - 5 < sau egal cu 4}

Răspuns :

[tex]3x-5 \leq 4\\ 3x \leq 9 \\ x \leq 3[/tex]
x natural => A={0,1,2,3}
3(x-5)≤4 ⇔ 3x-15≤4 |+15 ⇔ 3x≤19|:3 ⇔ x≤19/3⇔x∈{0,1,2,3,4,5,6}