Solution - Simplification or other simple results

Step  1  :

            4
 Simplify   —
            5

Equation at the end of step  1  :

   128         5     4
  (——— • (0 -  —)) • —
   200         4     5

Step  2  :

            5
 Simplify   —
            4

Equation at the end of step  2  :

   128         5     4
  (——— • (0 -  —)) • —
   200         4     5

Step  3  :

            16
 Simplify   ——
            25

Equation at the end of step  3  :

   16   -5    4
  (—— • ——) • —
   25   4     5

Step  4  :

Final result :

  -16            
  ——— = -0.64000 
  25