Question 496613
x + x + 20 = 180.
2x = 160
x = 80 degrees, this is the angle.
The supplement is 180 - 80 = 100 degrees. 
80 degrees + 20 degrees = 100 degrees, so this does check.
The complement is 90 degrees - 80 degrees = 10 degrees, this is our complement.
Cleomenius.