Question 331978
If x = the supplement and the angle is 15° more than twice its supplement, then the angle is 2x + 15.

x + 2x+15 = 180
3x + 15 = 180
3x = 165
x = 55° <= supplement
2x+15 = 2(55) + 15 = 125° <= angle

The supplement is 55°.