Answer:
x = 13°
Explanation:
angle p + 98° = 180° [angles on a straight line add up to 180°]
p = 180° - 98°
p = 82°
angle q = 85° [alternate angles with the 85° angle]
Inside the yellow triangle:
p + q + x = 180° [angles inside a triangle add up to 180°]
82° + 85° + x = 180°
x = 180° - 82° - 85°
∴ x = 13°