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The system of linear equations x+3y-z=15 2x+4y+2z 30 3x+y-z=17 has a unique solution. What is the value of y in this solution?

The system of linear equations x+3y-z=15 2x+4y+2z 30 3x+y-z=17 has a unique solution. What is the value of y in this solution?

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