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For what values of k, the system of linear equations x+y+z = 2 2x+y-z = 3 3x+2y+kz = 4 has a unique solution ?

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For what values of k, the system of linear equations  x+y+z = 2

2x+y-z = 3

3x+2y+kz = 4

has a unique solution ?
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For a unique solution

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