Absolute Value Equations

Absolute value equations need to be set up with positive and negative results.
For example:

|3X +6|= 15

That is
3X + 6 = 15
3X = 15 - 6
3X = 9
X= 9/3
X= 3

ALSO

3X + 6 = -15
3X = -15 -6
3X = -21
X= -21/3
X= -7

The solution is X = 3 or X = -7