What is the answer to this? And I would like if anyone else could explain how they got the answer for me to understand.

Guess:
14 + j ohms
Step-by-step explanation:
3 + j5 = j8
5 - j8 = -3
6 + j4 = 10
8 + -3 + 10 = j15.
The closest thing to that is 14 + j.
That's my guess, but i'm probably wrong!