Proof: Subtract From Both Sides Mirror

Let's prove the following theorem:

if a = b, then a - c = b - c

Proof:

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

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