Solution - Simplification or other simple results

Step  1  :

            6x + 5
 Simplify   ——————
            4 + 5x

Equation at the end of step  1  :

   d   (6x + 5)
  —— • ————————
  dx    5x + 4 

Step  2  :

             d
 Simplify   ——
            dx

Canceling Out :

 2.1    Canceling out d as it appears on both sides of the fraction line

Equation at the end of step  2  :

  1   (6x + 5)
  — • ————————
  x    5x + 4 

Step  3  :

Final result :

     6x + 5   
  ————————————
  x • (5x + 4)