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User Gervs
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2 Answers

5 votes
x + 129 = 180
x = 180 - 129 = 51 degrees

If you need to show reasons
Adjacent angles on a straight line add to 180 (supplementary)
Corresponding angles on parallel lines are equal
User Sander Koldenhof
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1 vote

Answer:

jojo reference

Explanation:

User Anatoly Deyneka
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