Geometry

Question Analysis:  
This question involves recognizing which fundamental property of equality is applied when simplifying an equation.  
The main focus is on understanding how equality properties are used in solving equations.  

Key Concept Explanation:  
- The Subtraction Property of Equality states that if , then .  
- In this case, subtracting 5 from both sides maintains equality.  

Step-by-Step Solution:  
1. Given: .  
2. Subtract 5 from both sides:  
   

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