Respuesta :

Nayefx

Answer:

20

Step-by-step explanation:

to understand this

you need to know about:

  • equation
  • PEMDAS

tips and formulas:

  • a straight line contains 180°

let's solve:

according to the question

7x+x+20=180

=>8x+20=180

=>8x=160

therefore

x=20

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