Answer:
x=40
Step-by-step explanation:
if you add the angle with a value of (x) to the angle with a value of (4x - 20) the sum will be equal to 180 degrees because a straight line is created with the sum of the two angles. A straight line is basically just an angle with a value of 180 degrees.
x+(4x-20)=180
5x-20=180
5x=200
x=40
