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180 = x + 2x - 15 + 3x + 45
180 = 6x + 30
6x = 180-30
6x = 150
x = 150/6
x = 25
x = 25 derajat
2x - 15 = ( 2 x 25) - 15 = 50-15 = 35 derajat
3x + 45 = (3 x 25) + 45 = 75 + 45 = 120 derajat
5x+30=180
5x=180-30
5x=150
x=50