Proof: Multiplicative Property of Equality Variation 1

Let's prove the following theorem:

if a = b, then ca = cb

Proof:

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Given
1 a = b
Proof Table
# Claim Reason
1 ac = bc if a = b, then ac = bc
2 bc = cb bc = cb
3 ac = cb if ac = bc and bc = cb, then ac = cb
4 ca = ac ca = ac
5 ca = cb if ca = ac and ac = cb, then ca = cb

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