Question 284001
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Let *[tex \Large x] represent the measure of the angle you are trying to find.  Then the measure of its supplement must be *[tex \Large x\ -\ 20].  The sum of the measures of two supplementary angles is 180 degrees, so:

*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ +\ (x\ -\ 20)\ =\ 180]

Just solve for *[tex \Large x]

John
*[tex \LARGE e^{i\pi} + 1 = 0]
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