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   ——
            28

Equation at the end of step  1  :

      x3
  8 • ——
      28

Step  2  :

Final result :

  2x3
  ———
   7