Solution - Simplification or other simple results

Step  1  :

            z
 Simplify   —
            e

Equation at the end of step  1  :

  z
  — ÷ u ÷ s
  e

Step  2  :

         z      
 Divide  —  by  u
         e      

Equation at the end of step  2  :

   z
  —— ÷ s
  eu

Step  3  :

          z      
 Divide  ——  by  s
         eu      

Final result :

   z 
  ———
  eus