Measure of an angle that is twice as large as its supplement

X + y = 180
x = 2y (x is the angle twice as large) 
2y + y = 180 = 3y
60 = y
2y = x = 60(2) = 120
x = 120 and is therefore the measure of an angle that is twice as large as its supplement. 

Omg that is a big question and weird words and i’m only 5