Answer:
x = 30
Explanation:
3x + 15 and 75 are adjacent angles and are supplementary, then
3x + 15 + 75 = 180
3x + 90 = 180 ( subtract 90 from both sides )
3x = 90 ( divide both sides by 3 )
75° and (3x + 15)° are supplementary (add up to 180°).
Therefore 75 + 3x + 15 = 180, 3x = 90 and x = 30.
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