Proof: Substitute First Term Pre

Let's prove the following theorem:

if a = e, then (a + b) + c = (e + b) + c

Proof:

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

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