Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "*-21" was replaced by "*(-21)".

Step  1  :

            -21
 Simplify   ———
            16 

Equation at the end of step  1  :

         8   8    -21
  0 -  ((— • —) • ———)
         3   9    16 

Step  2  :

            8
 Simplify   —
            9

Equation at the end of step  2  :

         8   8    -21
  0 -  ((— • —) • ———)
         3   9    16 

Step  3  :

            8
 Simplify   —
            3

Equation at the end of step  3  :

         8   8    -21
  0 -  ((— • —) • ———)
         3   9    16 

Step  4  :

Final result :

  28           
  —— = 3.11111 
  9