||2*x + 1| + |3*x + 1|| <= x + 2
Abs(|2*x + 1| + |3*x + 1|) <= x + 2
And(-2/3 <= x, x <= 0)
(-2/3 <= x)∧(x <= 0)
[-2/3, 0]
x in Interval(-2/3, 0)