(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2
(4y+9)/5-(3+2y)/3=(y-5)/2
6(4y+9)-10(3+2y)=15(y-5)
24y+54-30-20y=15y-75
11y=99
y=9