.
Divide both sides by 3.
You will get an equivalent inequality
|u+5| > 4.
The solutions are those values of "u" that are remoted more than 4 units from -5, i.e. u < -9 and/or u > -1.
Answer. The solutions are these two intervals u < -9 and u > -1.
In the interval notation, the solution is the union of these two intervals: (
,
) U (
,
).
