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Answer:
x = 20
y = 70
Explanation:
The exterior angle marked 40° is the sum of the remote interior angles in the isosceles triangle at lower right, both of which are x°.
40° = 2x°
x = 20 . . . . . divide by 2°
The angle marked y° is the complement of the one marked x°.
y = 90 -x = 90 -20
y = 70