First, find the common denominator, which in this case, would be 24, so 5/8 turns into 15/24 and y+2/12 turns into 2y+4/24. Then, because they both have the same denominator, they cancel each other out so the equation is simplified to 2y+4=15. Then, you subtract 4 from both sides of the equation and get 2y=15. Finally, you would divide both sides by 2 and end up with y=7.5