x+120°=180°
x=180°-120°
x=60° (D)
x + 120° = 180°
x = 180° - 120°
x = (180 - 120)°
x = 60° => D
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x+120°=180°
x=180°-120°
x=60° (D)
x + 120° = 180°
x = 180° - 120°
x = (180 - 120)°
x = 60° => D