Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "x2"   was replaced by   "x^2".  1 more similar replacement(s).

Step  1  :

Equation at the end of step  1  :

  0 -  (2x2 • x2)
 Step  2  :

Final result :

   -2x4