Respuesta :

Answer:

y = -16.5

Step-by-step explanation:

18y - 18 + 6y  = 180

-18y - 18 + 6y (-18y) = 180

-18 - 12y = 180

+18 - 12y = 180 (+18)

-12y = 198

198/-11 = -16.5