Respuesta :

180 - ( 19x + 3 ) + 9x + 1 + 11x - 2 = 180

180 - 19x - 3 + 9x + 1 + 11x - 2 = 180

- 19x - 3 + 9x + 1 + 11x - 2 = 180 - 180

- 19x - 3 + 9x + 1 + 11x - 2 = 0

x - 4 = 0

x = 4