Solution:
The easiest way to solve for x is to use the vertically opposite angles property. When we apply the property, we get the value of x to be 125°. Let's solve this using an alternative method to prove the value of x to be 125°.
Since:
125° + 55° = 180°180° = 180°
Then:
55° + x° = 180=> x° = 180 - 55=> x° = 125 (Proved)
Hoped this helped!