Respuesta :

-8-5y= 12-9y
⇒ 9y -5y= 12+8
⇒ 4y= 20
⇒ y= 20/4
⇒ y= 5

Final answer: y=5~

(-8) - 5y = 12 - 9y       Add 9y to both sides
(-8) +4y = 12              Add -8 to both sides
4y = 20                       Divide both sides by 4
y = 5