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180 derajat = 2x + x + 40 + 4x + 35
180 derajat = 7x + 75 derajat
7x = 105 derajat
x = 105/7 = 15 derajat
sudut A = 2x = 30 derajat
sudut B = x + 40 = 55 derajat
sudut C = 4x + 35 = 95 derajat