Respuesta :

Answer:

x = 18

Explanation:

  • Line E B C Needs To Equal 180°
  • Create An Equation

3x + 5 + 3x + 4 + 3x + 9 = 180

  • Simplify Both Sides Of The Equation

(3x + 3x + 3x) + (5 + 4 + 9) = 180( Combine Like Terms)

9x + 18 = 180

9x + 18 = 180

  • Subtract 18 From Both Sides

9x + 18 − 18 = 180 − 18

9x = 162

Divide Both Sides By 9

9x / 9 = 162 / 9

x = 18

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