Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a2"   was replaced by   "a^2". 

Step  1  :

Equation at the end of step  1  :

  (2•5a2) -  20a

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   10a² - 20a  =   10a • (a - 2) 

Final result :

  10a • (a - 2)