Respuesta :

Answer:

x = 12

Step-by-step explanation:

(9x - 4)° + ( 5x + 16 )° = 180°

9x + 5x - 4 + 16 = 180

14x + 12 = 180

14x = 180 - 12

14x  = 168

x = 12

Otras preguntas