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En base al enunciado nos quedaría:
180° - (90° - x) = 3/2 ((180° - x ) - (90° - x))
Resolviendo:
180° - 90° + x = 3/2 (180° - x - 90° + x)
90° + x = 3/2 (90°)
90° + x = 270°/2
90° + x = 135°
x = 135° - 90°
x = 45°
RESPUESTA:
45°