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): "0.45" was replaced by "(45/100)".

Step  1  :

             9
 Simplify   ——
            20

Equation at the end of step  1  :

                9
  ((d2) • f) • ——
               20

Step  2  :

Final result :

  9d2f
  ————
   20