Algebra-2

Question Analysis
This question tests the student's ability to use the substitution method to solve a system of three equations. The key step is solving one of the equations for one variable and expressing it in terms of the other variables.

Key Concept Explanation
The substitution method involves solving one equation for one variable and substituting that expression into the other equations to reduce the system to fewer variables.

Step-by-step Solution
1. Start with the first equation:
2. Solve for

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