|6х-1|меньше или равно 1
- 1≤ 6x - 1 ≤ 1 - 1 + 1 ≤ 6x ≤ 1 + 1 0 ≤ 6x ≤ 2 0/6 ≤ x ≤ 2/6 0 ≤ x ≤1/3 x ∈ [ 0; 1/3]