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  :

            6
 Simplify   —
            1

Equation at the end of step  1  :

  ((f2) • d) • 6

Step  2  :

Final result :

  (2•3f2d)