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sACB = 2x°
sABC = ?°
(4x - 10)° = sBAC + sACB
4x - 10 = 60 + 2x
4x - 2x = 60 + 10
2x = 70
x = 70/2 = 35°
sACB = 2x° = 2(35) = 70°
sABC + sACB + sBAC = 180° (Segitiga)
sABC + 70 + 60 = 180
sABC + 130 = 180
sABC = 180 - 130 = 50° (A)
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