Answer :
Commutative:
93 + (68 + 7) ⇒ (68 + 7) + 93
Associative:
93 + (68 + 7) ⇒ (93 + 68) + 7
Identity:
93 + (68 + 7) + 0 ⇒ 93 + (68 + 7)
93 + (68 + 7) ⇒ (68 + 7) + 93
Associative:
93 + (68 + 7) ⇒ (93 + 68) + 7
Identity:
93 + (68 + 7) + 0 ⇒ 93 + (68 + 7)