13 2/9-(7 5/9+y)=3 5/9
13 2/9 - 7 5/9 - y = 3 5/9
119/9 - 68/9 - y = 32/9
-y = 32/9 - 119/9 + 68/9
- y = - 19/9
y = 2 1/9