The angle given by the circle C, .
are a liner pair,and the angles of a linear pair are supplemantary.
(Substitute )
(Add 4 to each side)
(Simplify)
(Divide each side by 4)
(Simplify)
Use the value of x to find .
The angle given by .
(Substitute )
(Multiply)
(Add)
The value of .
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