justicelamar justicelamar
  • 13-05-2021
  • Mathematics
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Аноним Аноним
  • 13-05-2021

Step-by-step explanation:

7x-40=3x+3x-20 {exterior angle of triangle is equal to the sum of its opposite interior angle}

  • 7x-6x= -20+40
  • x= 20

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