Hi, I have this problem which I don't know how to solve...I don't want the answer, but the properties I need to work it out so that I can apply to other problems (but if I need to be shown with an example, then I don't mind being shown how to solve it). Thanks a lot!

Let the solution set of be and the solution set of be . What is the solution set of ? What is the solution set of ? What relationship holds between the solution set of and the solution set of ?