Respuestas

2013-05-19T22:36:45+02:00
3 [ (180 + X) - (90 - X) ] = 2 [ 180 - (90 - 2X)]
3 (90) = 2 (90 + 2X)
270 = 180 + 4X
90 = 4X
X = 22.5