Two angles are sumplementary, and one is 40 degrees More than three times the other. Find the smaller angle

Two angles are supplementary
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If one angle is x then the other is 3x+40 and they add up to 180:

x+3x+40=4x+40=180, 4x=140 so x=35°. Check: the larger angle is 105+40=145° and is supplementary to 35°.

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