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8x = 180-40
8x = 140
x = 140/8 = 17,5
sudut abd = 40 +5x
= 40 + 5. 17,5
= 40 + 87,5 = 127, 5
40+8x = 180
40-40+8x = 180-40
8x = 140
8x/8 = 140/8
x = 17,5
sudut ABD = 40+5x
= 40 + 5*17,5
= 40 + 87,5
= 127,5