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180° = 2x + 18 + 2x - 10
180° = 2x + 2x + 18 - 10
180° = 4x +8
4x = 180-8
4x = 172
x = 172/4
x= 43
sudut B = 2.43 + 18
sudut B = 86+18
sudut B = 104°