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jadi,
3x + (x + 20) + 10 = 180
4x + 30 = 180
4x = 150
x = 37,5 derajat
3x + x+20 + x+10 = 180
5x +30 = 180
5x = 180-30
5x = 150
x = 150/5
x = 30