Geometry

Question Analysis:  
This problem involves setting up an equation based on the perimeter of two equilateral triangles.  

Key Concept Explanation:  
Since both triangles are equilateral, their perimeters can be calculated using:    
Since the perimeters are equal, we equate the expressions.  

Step-by-Step Solution:  
1. Write the perimeter equations:  
   
2. Cancel out the common factor of 3:  
   
3. Solve for

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