ini gimana ya ada yg tahu

180 = 65 + 5a
180 - 65 = 5a
115° = 5a
115 ÷ 5 = a
23 = a


180 = 65 + (a+b)
180 - 65 = (23+b)
115 = 23+b
115 - 23 = b
b = 92