Algebra-1

Question Analysis  
This question involves finding the third term of an arithmetic sequence using the first two terms.  
The main focus is on applying the definition of the common difference to extend the sequence.  

Key Concept Explanation  
In an arithmetic sequence, each term after the first is obtained by adding the common difference to the previous term. Thus, .  

Step-by-Step Solution  
1. Calculate the common difference: .  
2. Find the third term by adding to the second term:

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