1) Commutative: you change [tex] 6x+3\mapsto 3+6x [/tex]
2) Associative: you change the parenthesis
3) Distrivutive: you factor [tex] x [/tex]
4) Subtraction: you compute [tex] 6-5=1 [/tex]
5) Multiplicative identity: you use the fact that every number remains unchanged if you multiply it by 1.
