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α = β
y = α + 30 ⇒ y - 30 = α
y = β + 30 ⇒ y - 30 = β
s = 105
α + β + y + s = 360
y - 30 + y -30 + y + 105 = 360
3y - 60 + 105 = 360
3y = 360 + 60 -105
3y = 315
y = 105
105 - 30 = α 105 - 30 = β
75 = α 75 = β
75 + 75 + 105 +105 = 360
360 = 360