Step-by-step explanation:
13x - 26 °+ 5x +8° = 180° ( being co- interior angle)
13x + 5x - 26 °+ 8° = 180°
18x - 18 = 180°
18x = 180°- 18°
18x = 162°
x= 162° ÷ 18
x= 9°
hope it help
