Solution - Simplification or other simple results

Step  1  :

             d
 Simplify   ——
            dx

Canceling Out :

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

Equation at the end of step  1  :

  1
  — • 5
  x

Step  2  :

Final result :

  5
  —
  x