Solution - Simplification or other simple results

Step  1  :

            3
 Simplify   —
            4

Equation at the end of step  1  :

        3         3
  0 -  (— • (0 -  —))
        7         4

Step  2  :

            3
 Simplify   —
            7

Equation at the end of step  2  :

        3   -3
  0 -  (— • ——)
        7   4 

Step  3  :

Final result :

   9           
  —— = 0.32143 
  28