Solution - Simplification or other simple results

Step  1  :

             5
 Simplify   ——
            12

Equation at the end of step  1  :

  18    5
  —— • ——
  11   12

Step  2  :

            18
 Simplify   ——
            11

Equation at the end of step  2  :

  18    5
  —— • ——
  11   12

Step  3  :

Final result :

  15           
  —— = 0.68182 
  22