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  :

            a
 Simplify   —
            t

Equation at the end of step  1  :

   285            a
  (——— • (r17)) • —
   70             t
 Step  2  :
            57
 Simplify   ——
            14

Equation at the end of step  2  :

   57          a
  (—— • r17) • —
   14          t

Step  3  :

Equation at the end of step  3  :

  57r17   a
  ————— • —
   14     t

Step  4  :

Final result :

  57r17a
  ——————
   14t