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8x = 180 - 60 ( 5 habis karena +5 dan -5)
8x = 120
x = 15
c = 5x + 5 = 5 ( 15)+5 = 75+5 = 80
b = 3x-5 = 3(15) -5 = 45-5 = 40
5x +3x + 5 - 5 + 60 = 180
8x + 60 = 180
8x = 120
x = 15
sudut b ===> 3x - 5 = 3(15) - 5 = 45 - 5 = 40
sudut c ===> 5x + 5 = 5(15) + 5 = 75 + 5 = 80