Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "t4"   was replaced by   "t^4". 

Step  1  :

Equation at the end of step  1  :

  0 -  (24t216 • t480)
 Step  2  :

Final result :

   -24t696