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
  — • (6x + 3)
  x

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   6x + 3  =   3 • (2x + 1) 

Final result :

  3 • (2x + 1)
  ————————————
       x