Solution - Simplification or other simple results

Step  1  :

               1  
 Simplify   ——————
            5x + 1

Equation at the end of step  1  :

   d        1   
  —— • (————————)3)
  dx    (5x + 1)
 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       1    
  — • —————————
  x   (5x + 1)3

Step  3  :

Final result :

        1      
  —————————————
  x • (5x + 1)3