Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "x8"   was replaced by   "x^8". 

Step  1  :

Equation at the end of step  1  :

  0 -  (22x216 • x84)
 Step  2  :

Final result :

   -22x300