Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "x3"   was replaced by   "x^3". 

Step  1  :

            x3
 Simplify   ——
            7 

Equation at the end of step  1  :

  3   x3
  — • ——
  4   7 

Step  2  :

            3
 Simplify   —
            4

Equation at the end of step  2  :

  3   x3
  — • ——
  4   7 

Step  3  :

Final result :

  3x3
  ———
  28