Step-by-step explanation:
z = 86° (Because they are opposite angles)
z + 8x - 66° = 180° (They form a linear pair)
=> 86° + 8x - 66° = 180°
=> 8x - 66° = (180 - 86)°
=> 8x - 66 = 94°
=> 8x = 94° - 66°
=> 8x = 28
=> x = 28/8
=> x = 3.5°
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