Solution - Simplification or other simple results

Step  1  :

            2
 Simplify   —
            7

Equation at the end of step  1  :

   5   2
  —— • —
  15   7

Step  2  :

            1
 Simplify   —
            3

Equation at the end of step  2  :

  1   2
  — • —
  3   7

Step  3  :

Final result :

   2           
  —— = 0.09524 
  21