If the system of equations x+ y + z = 5 ...

If the system of equations x+ y + z = 5 , x+2y+3z=9, `x+3y+alphaz=beta` has unique solution, then value of `alpha` can’t be:

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`Delta = |{:(1,1,1),(1,2,3),(1,3,alpha):}|`
` 2 alpha - 9 + 3 - alpha + 1 ne 0 `
` alpha - 5 ne 0 , alpha ne 5 `

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