(3*x + 1)*5 - (1 - 2*x)*2 >= x
-2*(1 - 2*x) + 5*(3*x + 1) >= x
[-1/6, oo)
x in Interval(-1/6, oo)
And(-1/6 <= x, x < oo)
(-1/6 <= x)∧(x < oo)