We can split that problem into two inequalities:
1) and 2)
For the first one, we can first multiply both sides of the inequality by ,
and we arrive at .
Then, add to both sides:
We can factor out :
and then divide both sides by , so the final inequality is:
It's the same process for the second inequality. Once you have both inequalities, you can mesh them together to form one big inequality with in the center.