Answer:
x = 25
Explanation:
Here's another way to solve this problem.
Start with congruent alternate interior angles of parallel lines AE and BC making m<C = x.
Theorem:
The measure of an exterior angle of a triangle is equal to the sum of the measures of its remote interior angles.
Angle ADB is an exterior angle of triangle BCD.
By the theorem above, we have
m<ADB = m<DBC + m<DCB
50 = x + x
50 = 2x
25 = x
x = 25