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9x + 45 = 180
9x = 180 - 45
9x = 135
x = 135 : 9 = 15 derajat
b. 3x = 3(15) = 45 derajat
(4x - 5) = 4(15) - 5 = 60 - 5 = 55 derajat
(50 + 2x) = 50 + 2(15) = 50 + 30 = 80 derajat