Respuesta :

Answer:

x=10°

Step-by-step explanation:

(5x+7)°+(4x+16)°+(5x+17)°=180° (a triangle contains 180°)

5x+7+4x+16+5x+17=180

14x+40=180

14x=180-40

14x=140

x=140/14

x=10

x=10°

note:to avoid writing ° always. I made it implicit.

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