help me out and please explain how you got the answer!!

Answer:
The choice B. q = 62
Step-by-step explanation:
[tex] - 55 + q = 7 \\ q = 7 + 55 \\ q = 62[/tex]
We put the known on one end and the unknown on the other, and when we switch from one end to the other, the sign changes.
I hope I helped you^_^