Proof: Reordering Terms Theorem

Let's prove the following theorem:

(ab) ⋅ c = (ca) ⋅ b

Proof:

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Proof Table
# Claim Reason
1 (ab) ⋅ c = (ac) ⋅ b (ab) ⋅ c = (ac) ⋅ b
2 ac = ca ac = ca
3 (ac) ⋅ b = (ca) ⋅ b if ac = ca, then (ac) ⋅ b = (ca) ⋅ b
4 (ab) ⋅ c = (ca) ⋅ b if (ab) ⋅ c = (ac) ⋅ b and (ac) ⋅ b = (ca) ⋅ b, then (ab) ⋅ c = (ca) ⋅ b
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