Write an absolute value equation that has the given solutions 3 and 9

The absolute value of the a certain number is the positive equivalent of the number. 

Example,
The absolute value of 3, expressed as I3I is 3. Also,
the absolute value of -3, expressed as I-3I is 3. 

For this item, we have the equation,
              Ix - 6I = 3

If we substitute 3 to x, we have,
             I3 - 6I = I-3I = 3
Also, if we substitute 9 to the equation,
            I9 - 6I = I3I = 3

Thus, we can have the equation as given above,
          Ix - 6I = 3
as the answer.

It is to be noted that there are still other equations that can be used as answer to this item.