Algebra-1

Question Analysis
This question tests the student's ability to solve a system of linear equations using the substitution method. The given equations are and .

Key Concept Explanation
The substitution method involves expressing one variable in terms of the other and then substituting this expression into the other equation to eliminate one variable.

Step-by-step Solution
1. Start with the given equations: and .
2. Substitute into the second equation: .
3. Simplify the equation:

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