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sudut D = 180 - (3x + 25)
= 180 - 3x - 25
= 155 - 3x
3x + 25 + 80 + 5x + 155 - 3x = 360
5x = 360 -155 - 80 - 25
5x = 100
x = 20
sudut A = 3x + 25
= 3(20 ) + 25
= 60 + 25
= 85 (C)