Geometry

Question Analysis:
This question involves identifying the properties used in a two-column proof to solve the equation .
The main focus is on understanding the Distributive Property, Subtraction Property of Equality, and Division Property of Equality.

Key Concept Explanation:
1. Distributive Property: Expands to .  
2. Subtraction Property of Equality: Subtracts 10 from both sides to isolate .  
3. Division Property of Equality: Divides both sides by 2 to solve for .  

Step-by-Step Solution:
1. Distributive Property:  
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