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". 

Step  1  :

Equation at the end of step  1  :

  (3 • (x2)) -  (2•3x2)
 Step  2  :

Equation at the end of step  2  :

  3x2 -  (2•3x2)

Step  3  :

Final result :

  -3x2