Respuesta :

The 2 marked angles add up to 180 if m and n are parallel.

I cant solve for x because the image is very unclear.
choixongdong
6x +5 and 5x - 12
so
6x + 5 + 5x - 12 = 180
11x - 7 = 180
11x = 187
  x = 187/11
  x = 17

answer 
x = 17

hope it helps

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good job