Proof: Rearrange Sum Equal 3

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	(a + b) + c = c + (a + b)	(a + b) + c = c + (a + b) (Commutative Property of Addition)
2	c + (a + b) = (c + a) + b	c + (a + b) = (c + a) + b (associative)
3	(a + b) + c = (c + a) + b	if (a + b) + c = c + (a + b) and c + (a + b) = (c + a) + b, then (a + b) + c = (c + a) + b (Transitive Property of Equality)

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