Proof: Subtraction Example
Let's prove the following theorem:
if x = a - a, then x = 0
    
    
    
    Proof:
  
      
      Given
      
    
    
      
  
  
| 1 | x = a - a | 
|---|
| # | Claim | Reason | 
|---|---|---|
| 1 | a - a = 0 | a - a = 0 | 
| 2 | x = 0 | if x = a - a and a - a = 0, then x = 0 | 
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