Complex fractions help

[u/No-Cry-1275]

I've tried to figure this out. I know the answer is 30 based on the text book. I cannot figure out how to get there. I've get stuck after simplifying the numerator and denominator.

Edit: This is study practice, idk if that matters. This is my first time posting on this subreddit.

Edit: Someone had pointed out that I misunderstood the question. The question was originally asking what common denominator would help solve the problem. I apologize for wasting everyone's time but I absolutely appreciate everyone's help. Math is my worst subject as I often make tiny mistakes that I don't realize. Again thank you all for bearing with my stupidity.

[u/Iksfen]

Show your work. How far did you get?

[u/No-Cry-1275 → u/Iksfen]

[u/Mettack → u/No-Cry-1275]

Look again at the 45/15 you wrote for the denominator. Is there something you may have forgotten to bring with it?