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x + (1/2)(90º-x) = 2*(90º-x)
x + 45º - x/2 = 180º - 2x
3x - x/2 = 135º
5x/2 = 135º
x = 270º/5
x = 54º
El valor del ángulo es 54º.
Saludos! Jeizon1L