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	Các bình luận về: Trong không gian \(Oxyz\), Cho mặt cầu \(\left( S \right)3{x^2} + 3{y^2} + 3{z^2} + 6x + 12y – 18z – 3 = 0\). Tâm của \((S)\) có tọa độ là	</title>
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