Помогите решить пожалуйста!
Найти центр и радиус сферы.

1)[tex] x^{2} + y^{2} + z^{2} -6x+2z+1=0[/tex]
2)[tex] x^{2} + y^{2} + z^{2} -8y-2z-8=0[/tex]
3)[tex] x^{2} + y^{2} + z^{2} - 2x + 4y - 6z - 2 =0[/tex]

Заранее спасибо!
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