Respuesta :

Answer:

I am not sure what your "bold angle" is, but x=8.

Step-by-step explanation:

5x+5+16x+7=180

21x+12=180

21x-12=180-12

21x=168

168/21=8

x=8
5x+5+16x+7=180

21x+12=180
-12. -12
168
——-
21
X=8

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