`x^2 + y^2 + z^2 + 12x- 2y + 4z + 16 =0`

`x^2 + y^2 + z^2 + 12x - 2 y + 4z - 16 = 0`

`x^2 + y^2 + z^2 - 12x + 2y- 4z + 16 = 0`

`x^2 + y^2 + z^2 - 12x + 2y- 4z + 25 = 0`