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5X - 50 = Y + 10 (2)
Trabajando en (2)
5X - 50 = Y + 10
5X - Y = 50+ 10
5X - Y = 60 (3)
Reducimos (1) y (2)
X + Y = 180
5X - Y = 60
6x = 240
X = 240/6
X = 40
Reemplazas X=40 en (1)
X + Y = 180
Y = 180 - X
Y = 180 - 40
Y = 140