Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "d2"   was replaced by   "d^2". 

(2): "0.421" was replaced by "(421/1000)".

Step  1  :

             421
 Simplify   ————
            1000

Equation at the end of step  1  :

                421
  ((d2) • f) • ————
               1000

Step  2  :

Final result :

  421d2f
  ——————
   1000