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): "0.315" was replaced by "(315/1000)".

Step  1  :

             63
 Simplify   ———
            200

Equation at the end of step  1  :

                63
  ((d2) • f) • ———
               200

Step  2  :

Final result :

  63d2f
  —————
   200