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β = 85°
Dicho triángulo:
180° = 3a + 2a + 85°
5a = 180° - 85°
a = (95°) / 5
a = 19°
Triángulo que contiene x:
180° = 95° + 19° + x
x = 180° - 95° - 19°
x = 66°
Respuesta: a) 66°
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