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x^2+17y^2+4z^2+10xy+4xz+8yz+6x+14y=k canonical form

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 2          2                    2                             
x  - k + 4*z  + 6*x + 14*y + 17*y  + 4*x*z + 8*y*z + 10*x*y = 0
$$- k + x^{2} + 10 x y + 4 x z + 6 x + 17 y^{2} + 8 y z + 14 y + 4 z^{2} = 0$$
-k + x^2 + 10*x*y + 4*x*z + 6*x + 17*y^2 + 8*y*z + 14*y + 4*z^2 = 0