.
Add 7 to both side. You will get an equivalent inequality
> 0.
Factor left side. You will get an equivalent inequality
(x+5)*(x+4) > 0, or, which is the same (x-(-5))*(x-(-4)) > 0.
The solution is the set { x < -5 } U { x > -4 }, or,
in the interval form (,) U (,).
Solved.
If you want to learn on how to solve quadratic inequalities, read the lesson
- Solving problems on quadratic inequalities
in this site.
Also, you have this free of charge online textbook in ALGEBRA-I in this site
- ALGEBRA-I - YOUR ONLINE TEXTBOOK.
The referred lesson is the part of this online textbook under the topic "Inequalities".