Proof: Substitute 2

Let's prove the following theorem:

if the following are true:
  • a + b = c
  • d = b

then a + d = c

Proof:

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

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