Proof: Rearrange Sum Equal 4

Let's prove the following theorem:

(c + a) + b = (a + b) + c

Proof:

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Proof Table
# Claim Reason
1 (a + b) + c = (c + a) + b (a + b) + c = (c + a) + b
2 (c + a) + b = (a + b) + c if (a + b) + c = (c + a) + b, then (c + a) + b = (a + b) + c

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