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kipiarov [429]
3 years ago
9

I don’t know how to do this and I need help

Mathematics
1 answer:
lilavasa [31]3 years ago
8 0
You are expected to remember and make use of the fact that adjacent angles in a parallelogram are supplementary. That means ...
  (2x -10) +(5x +15) = 180
  7x +5 = 180 . . . . . . . . . . . collect terms
  7x = 175 . . . . . . . . . . . . . . add -5. To find x, divide by 7.
  x = 25 . . . . . . . . the answer to the question
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