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  :

  (49 • (a2)) -  (2•7a)
 Step  2  :

Equation at the end of step  2  :

  72a2 -  (2•7a)

Step  3  :

Step  4  :

Pulling out like terms :

 4.1     Pull out like factors :

   49a² - 14a  =   7a • (7a - 2) 

Final result :

  7a • (7a - 2)