Solution - Simplification or other simple results

Step  1  :

            7
 Simplify   —
            4

Equation at the end of step  1  :

        1         7
  0 -  (— • (0 -  —))
        3         4

Step  2  :

            1
 Simplify   —
            3

Equation at the end of step  2  :

        1   -7
  0 -  (— • ——)
        3   4 

Step  3  :

Final result :

   7           
  —— = 0.58333 
  12