Answer:
x = 26 degrees
Explanation:
Supplementary angles mean that they sum up to be 180 degrees therefore
C + D = 180 degrees
128 degrees + D = 180 degrees
D = 180 degrees - 128 degrees
D = 52 degrees
If the measure of the angle D is two times the value of x then x is...
x = D/2
x = 52 degrees / 2
x = 26 degrees