You can put this solution on YOUR website!
Commutative property of addition (the terms 5 and 6x switched places)
Associative property of addition (the parenthesis was moved from the group
Distributive property (the x term was factored out. Notice if you distribute, you get
None of the four properties (Associative, Commutative, Distributive, or Additive Identity ) aren't in use in this step. You are simply adding 3 and 6 to get 9