y=5
steps
distribute the 2/9 to the (), 4=8/9y-4/9
add 4/9 to both sides, 4 and 4/9=8/9y
divide both sides by 8/9
btw 4 and 4/9 as an improper fraction is 40/9
also when dividing a fraction by a fraction you multiply by the reciprocal, 9/8
40/9 x 9/8=5