Răspuns :
3x - 7 ≤ 23
3x ≤ 23 + 7
3x ≤ 30 => x ≤ 10 => x ∈ {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
=> a), c), d)
3x ≤ 23 + 7
3x ≤ 30 => x ≤ 10 => x ∈ {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
=> a), c), d)