Solution - Simplification or other simple results

Step  1  :

            9
 Simplify   —
            7

Equation at the end of step  1  :

   -5   5    9
  (—— • —) • —
   6    3    7

Step  2  :

            5
 Simplify   —
            3

Equation at the end of step  2  :

   -5   5    9
  (—— • —) • —
   6    3    7

Step  3  :

            -5
 Simplify   ——
            6 

Equation at the end of step  3  :

   -5   5    9
  (—— • —) • —
   6    3    7

Step  4  :

Final result :

  -25            
  ——— = -1.78571 
  14