Proof: Add Term to Both Sides 2

Let's prove the following theorem:

if a = b, then c + b = c + a

Proof:

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

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