Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a1"   was replaced by   "a^1". 

Step  1  :

Equation at the end of step  1  :

  (4 • (a2)) -  22a
 Step  2  :

Equation at the end of step  2  :

  22a2 -  22a

Step  3  :

Step  4  :

Pulling out like terms :

 4.1     Pull out like factors :

   4a² - 4a  =   4a • (a - 1) 

Final result :

  4a • (a - 1)