Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a7"   was replaced by   "a^7".  1 more similar replacement(s).

Step  1  :

            a72
 Simplify   ———
            172

Equation at the end of step  1  :

          a72
  (s12) • ———
          172
 Step  2  :

Final result :

  s12a72 
  ——————
   172