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Let P be an arbitrary point having sum o...

Let P be an arbitrary point having sum of the squares of the distances from the planes `x+y+z=0, lx-nz=0 and x-2y+z=0`, equal to 9. If the locus of the point P is`x^(2)+y^(2)+z^(2)=9`, then the value of `l-n` is equal to ________.

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