Respuesta :

Dan2008

Answer:

a=13

Step-by-step explanation:

-90=-6a-12

-6a=-78

a=13

princessganglol

Answer:

a=13 well as u can see the other comment already gave an explanation of y it is a=13 and i completely agree with it have a nice afternoon,night,or day to u

Step-by-step explanation: