Question 349140
HI,
*Note: the sum of supplementary  angles is 180 degrees
Let x be the "original" angle
{{{(3x + 20)}}} would be the other 
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{{{x + (3x + 20) = 180}}}
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simplify and solve for x
{{{4x + 20 = 180}}}
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{{{4x = 160}}}
x = 40 degrees  
(3x+20) = 140
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check Your answer:
40degrees  +  140degrees  = 180degrees