Algebra-1

Question Analysis
This question evaluates the student's understanding of the substitution method to solve a system of linear equations. One of the equations is already solved for , facilitating the substitution process.

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

Step-by-step Solution
1. Start with the given system: .
2. Substitute into the first equation: .
3. Simplify the equation: .
4. Combine like terms:

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