Respuesta :

lopezma152
Artaud is 12 years old because what u do is 28-40 and u get -12 and the opposite of -12 is 12, so he is 12 years old
EmoryMorejon

Answer:

Artaud is 12

Step-by-step explanation:

-x + 40 = 28

x = 40 - 28

x = 12