X would be would 117 ° and yes, it be an alternate exterior angle to 117°
How to find the missing angle?
Corresponding angles are angles that are formed in matching corners or corresponding corners with the transversal when two parallel lines are intersected by any other line (i.e. the transversal).
Thus the opposite angle to x will be a corresponding angle to 117°.
We can also see that x will be an alternate exterior angle to 117° because Alternate exterior angles are a pair of angles that are outside the two parallel lines but on either side of the transversal