Respuesta :

jcherry99

Answer:

D

Step-by-step explanation:

This triangle has 2 equal sides. It also has 2 equal angles. They are marked

  • 6x - 1
  • 77

So the equation is 6x - 1 = 77            Add 1 to both sides

6x i- 1 + 1 = 77 + 1

6x = 78                                                Divide by 6

6x/6  = 78/6

x = 13

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