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jakie2 jakie2
  • 22-02-2017
  • Mathematics
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Verified Answer :

Setor9
Setor9 Setor9
  • 22-02-2017

They are vertical angles. Vertical angles are angles opposite each other when two lines intersect.
Thus
3x=80-x. __Add x to both sides
3x+x=80-x+x.___Combine like terms
4x=80.____Divide both sides by 4 to find x
4/4x=80/4
1x=20
x=20

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