Answer:
x = 54
Explanation:
These are corresponding angles assuming that both transversals are parallel. Since these angles are corresponding, they must be congruent which means that both measures are the same.
Now the basic algebra can be done to find x:
(x + 12)° = 66°
(x)° = (66 – 12)°
(x)° = (54)°
x = 54