Solution - Simplification or other simple results

Step  1  :

            1
 Simplify   —
            7

Equation at the end of step  1  :

  7         1
  — • (0 -  —)
  3         7

Step  2  :

            7
 Simplify   —
            3

Equation at the end of step  2  :

  7   -1
  — • ——
  3   7 

Step  3  :

Final result :

  -1            
  —— = -0.33333 
  3