Proof: Compute 2

Let's prove the following theorem:

if a = 90 - 23, then a = 67

Proof:

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Given
1 a = 90 - 23
Proof Table
# Claim Reason
1 90 - 23 = 67 90 - 23 = 67
2 a = 67 if a = 90 - 23 and 90 - 23 = 67, then a = 67

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