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The locus of the point which moves so th...

The locus of the point which moves so that its distance from the line `x=y=-z` is twice its distance from the plane `x-y+z-1 = 0` is `x^2+y^2+z^2-3xy-5yz+3zx-4x+4y-4z+k=0` where the value of 'k' is

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