Perform the Indicated Operation $$\frac { 9 s + 4 } { 5 s b } - \frac { 4 s + 4 } { 5 s b }$$

Essay

Perform the indicated operation. Simplify the answer if possible. $$\frac { 9 s + 4 } { 5 s b } - \frac { 4 s + 4 } { 5 s b }$$