Question 370085
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Hi,
Let x represent the original angle.  it's supplement is (180°- x )
Write as we Read***
(180°- x ) = 2x - 150°
solving for x
180° + 150° = 3x 
330° = 3x
110° = x, the measure of the original angle

checking our answer
180° - 110° = 220° - 150° = 70°