I got 2(15+N) I hope this helped you
Y=3x-14 or 3x-14=Y
This is because you want to keep y positive, and so you add Y on both sides and get 3x=14+y, then you want to get y alone so you subtract 14 on both sides and get 3x-14=Y
(3 x 2.5) x 2 would be your answer