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  :

  (0 -  (8 • (x2))) -  (3•5x2)
 Step  2  :

Equation at the end of step  2  :

  (0 -  23x2) -  (3•5x2)

Step  3  :

Final result :

  -23x2