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x + y = 80 .....(I)
Cx = 2y -------> 90-x = 2y ....(II)
x- y = ???
resolviendo las ecuaciones (I) , (II)
x+y + 90-x = 80 + 2y
90+y = 80+2y
90 - 80 = 2y - y
10 = y
entonces el otro angulo medira: x + 10 = 80 -----> x = 70
nos piden la diferencia, entonces sería:
d = 70 - 10
d = 60°