9514 1404 393
Answer:
8
Explanation:
The external angle is half the difference of the intercepted arcs.
(2x +7) = (1/2)(78 -32)
2x +7 = 23 . . . . . simplify
2x = 16 . . . . . . . . subtract 7
x = 8 . . . . . . . . . . divide by 2
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