Solution - Simplification or other simple results

Step  1  :

            2
 Simplify   —
            7

Equation at the end of step  1  :

             -3    2
  0 -  ((3 • ——) • —)
             8     7

Step  2  :

            -3
 Simplify   ——
            8 

Equation at the end of step  2  :

             -3    2
  0 -  ((3 • ——) • —)
             8     7

Step  3  :

Final result :

   9           
  —— = 0.32143 
  28