How fast can you solve this geometry problem?

Check this picture:

Using geometry, find angle x.
Update: basak, I'm so busy watching the fireworks that I'll pretend I did not see your answer which you did in 10 minutes.
Update 2: It's not 20 degrees, and it's not that well known "hardest easy geometry problem"
Update 3: Yeah, that was amazing, Vikram P
Update 4: It's one of the little oddities of geometry that isoceles triangles of apex angles = (360) / (4n+6) can be subdivided into cascading isoceles triangles all of the same side lengths, equal to the base of the original. This proof is for the particular case n = 3, or apex angle = 20.
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