Answer:
x = 5
Step-by-step explanation:
The sum of two interior angles created by a transversal line is equal to 180°.
∴
(20x - 15)° + (19x)° = 180°
20x + 19x - 15 = 180
39x = 180 + 15 = 195
39x = 195
x = 195 ÷ 39 = 5
So x = 5.
