.
Factor left side to get an equivalent inequality:
(y-7)*(y-10) < 0.
The solution is the set { 7 < x < 10 },
or, in the interval form, the set (7,10).
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".