Question 1169307:  In the accompanying diagram , lines overleftrightarrow AB and overleftrightarrow CD intersect at point E. If m angle AED=(x+10) and m angle CEB=50 , find x. 
 Answer by ikleyn(52903)      (Show Source): 
You can  put this solution on YOUR website! . 
The angles AED and CEB are vertical and, therefore, are congruent.
It means that you need to solve this equation
    x + 10 = 50.
You do the rest.
 
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    - Vertical angles 
 
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