Solution - Simplification or other simple results

Step  1  :

            6
 Simplify   —
            7

Equation at the end of step  1  :

  5         6
  — • (0 -  —)
  3         7

Step  2  :

            5
 Simplify   —
            3

Equation at the end of step  2  :

  5   -6
  — • ——
  3   7 

Step  3  :

Final result :

  -10            
  ——— = -1.42857 
   7