Answer:
x=160/7 ° . or 22 6/7°
Step-by-step explanation:
Vertical angles
16x + 40° = 360 . 360-40 = 320
320°/14
x=160/7°
4.2 ×
2.1 × × 2 ×
2.1 + 2 = 4.2
2 - 3 = - 1