Answer :

Trim
4 1/5 + b = 9 3/5

4 1/5 - 4 1/5 + b = 9 3/5 - 4 1/5
(taking the same amount from each side to keep it balanced)

0 + b = 5 2/5
(subtracting 4 1/5 from each side)

b = 5 2/5
4 1/5+b=9 3/5
convert to improper fraction
21/5+b=48/5
since they both have the same denominators,you can subtract the numerators
   b= 48/5-21/5
   b=27/5= 5 2/5


hope this helps