If the solution of the equation 3a-4x = 6 of X is nonnegative, then the value range of a is

If the solution of the equation 3a-4x = 6 of X is nonnegative, then the value range of a is

3a-4x=6
4x=3a-6
X = (3a-6) / 4 is nonnegative
(3a-6)/4≥0
3a-6≥0
So a ≥ 2