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Decimos que:
(17x + 15)º + (10x + 30)º = 180º
(27x + 45)º = 180º
27x = 135
x = 5
------------------------
Si " = 5
--> (10x + 30)º
AOB = 10(5) + 30
AOB = 50 + 30
AOB = 80º