Solution - Simplification or other simple results

Step  1  :

             7
 Simplify   ——
            12

Equation at the end of step  1  :

        5          7
  0 -  (— • (0 -  ——))
        9         12

Step  2  :

            5
 Simplify   —
            9

Equation at the end of step  2  :

        5   -7
  0 -  (— • ——)
        9   12

Step  3  :

Final result :

   35           
  ——— = 0.32407 
  108