If the solution set of inequality x + | 2x-1 | < A is φ, then the value set of real number a is___ .

If the solution set of inequality x + | 2x-1 | < A is φ, then the value set of real number a is___ .

Analysis: the solution set of the inequality x + | 2x-1 | < A is ∈ draw the image of X + | 2x-1 |, as shown in the figure. From the figure, we can see that the minimum value of X + | 2x-1 |, is 0.5, so a ∈ (- ∞, 12]. So the answer is: (- ∞, 12]