Would it be {x: -1/18 ≥ x ≥ 13/18}?
| 6x - 2 | >= 7/3
6x - 2 >= 7/3 or 6x - 2 <= -7/3
6x >= 13/3 or 6x <= -1/3
x >= 13/18 or x <= -1/18
{x: x <= -1/18 or x >= 13/18 }
(If you make x = 0 from your interval, you'll see that the inequality will not be true.)
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| 6x - 2 | >= 7/3
6x - 2 >= 7/3 or 6x - 2 <= -7/3
6x >= 13/3 or 6x <= -1/3
x >= 13/18 or x <= -1/18
{x: x <= -1/18 or x >= 13/18 }
(If you make x = 0 from your interval, you'll see that the inequality will not be true.)