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8x + 20 = 180
8x = 160
x = 20
BOD : 3(20) + 25
=85
8x+20 = 180
8x = 180-20
8x = 160
x = 160/8
x = 20 cm
jadi sudut BOD = 3x+25 = 3.20+25 = 60+25 = 85˚ ...(A)