Substitution 2
Substitution 3

Proof: Substitution 3

Let's prove the following theorem:

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

then a = b + d

Proof:

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