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Let alpha, beta and gamma be real number...

Let `alpha, beta and gamma` be real numbers such that the system of linear equations
`x + 2y + 3z = alpha`
`4x + 5y + 6z = beta`
`7x + 8y + 9z = gamma-1`
Let P be the plane containing all those `(alpha, beta, gamma)` for which the above system of linear equations is consistent, and D be the square of the distance of the point `(0,1,0)` from the plane P.
The value of `D` is ______

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