Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "f2"   was replaced by   "f^2". 

Step  1  :

            81
 Simplify   ——
            4 

Equation at the end of step  1  :

               81
  ((f2) • d) • ——
               4 

Step  2  :

Final result :

  81f2d
  —————
    4