If an angle is equal to one-third of its supplement, then the measure of the angle is ____.
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than the angle is 60°
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x + 1/3x = 180
4x = 180 * 3
x = 180 * 3 / 4
x = 45 * 3
x = 135
1/3 x = 45
4x = 180 * 3
x = 180 * 3 / 4
x = 45 * 3
x = 135
1/3 x = 45
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