Solution - Simplification or other simple results

Step  1  :

            3
 Simplify   —
            4

Equation at the end of step  1  :

  5   3
  — • —
  7   4

Step  2  :

            5
 Simplify   —
            7

Equation at the end of step  2  :

  5   3
  — • —
  7   4

Step  3  :

Final result :

  15           
  —— = 0.53571 
  28