How do you solve #abs(8-3n)<=18#?
Every absolute value expression has two domains, one that is positive and one that is negative. Write both inequalities and find the respective ranges.
We write definition of the given absolute value expression as two equations with two different domain restrictions:
Simplify the domain restrictions:
Use the above to create two inequalities with the two domain restrictions:
Solving the ranges:
The two inequalities in  contradict so it must be discarded but  does not have a contradiction; we can write it as: