Umm well mean you just have to use like terms. start by doing any math until there are no parenthesis, and then you basically just use like terms to solve it. (like if you have then you use like terms) I would need specifics to be able to evaluate more, but I hope this helps!
You add all of them together if it’s labeled with a X. For example, the first X is 1 hour. If it has 2 Xs it would be 2 hours, if no X is shown above, it’s zero hours. Answer is 12 hours.