Algebra-1

Question Analysis
This question tests the student's ability to find the first term  of an arithmetic sequence given two terms. 

Key Concept Explanation
The common difference can be found by dividing the difference between the given terms by the number of intervals between them. The first term can then be found using the common difference and one of the given terms.

Step-by-step Solution
1. Identify the third term:
2. Identify the fifth term:
3. Find the common difference:
4. Find the first term:

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