Proof: Transitive Subtract 3
Let's prove the following theorem:
if f = (a + b) - b, then f = a
    
    
    
    Proof:
  
      
      Given
      
    
    
      
  
  
| 1 | f = (a + b) - b | 
|---|
| # | Claim | Reason | 
|---|---|---|
| 1 | (a + b) - b = a | (a + b) - b = a | 
| 2 | f = a | if f = (a + b) - b and (a + b) - b = a, then f = a | 
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