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): "0.869" was replaced by "(869/1000)".

Step  1  :

             869
 Simplify   ————
            1000

Equation at the end of step  1  :

                869
  ((d2) • f) • ————
               1000

Step  2  :

Final result :

  869d2f
  ——————
   1000