Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "r1"   was replaced by   "r^1". 

Step  1  :

            7
 Simplify   —
            3

Equation at the end of step  1  :

   7
  (— • r14) • c
   3

Step  2  :

Equation at the end of step  2  :

  7r14
  ———— • c
   3  

Step  3  :

Final result :

  7r14c
  —————
    3