Solution - Simplification or other simple results

Step  1  :

             9 
 Simplify   ———
            x39

Equation at the end of step  1  :

   d    9 
  —— • ———
  dx   x39

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    9 
  — • ———
  x   x39

Step  3  :

Multiplying exponential expressions :

 3.1    x¹ multiplied by x³⁹ = x^{(1 + 39)} = x⁴⁰

Final result :

   9 
  ———
  x40