Geometry

Question Analysis:  
This question tests knowledge of properties of equality used in algebraic proofs.
The focus is on identifying the correct step in solving for .  

Key Concept Explanation:  
- In a two-column proof, each algebraic transformation must have a valid reason.  
- The Addition Property of Equality states that if you add the same number to both sides, the equation remains valid.  

Step-by-Step Solution:  
1. Start with .  
2. To isolate

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