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Let \( S=\{x \in \mathbb{R}: x \geq 0 \) and \( 2|\sqrt{x}-3|+\sqrt{x}(\sqrt{x}-6)+6=0\} \). Then \( S \) :
(1) contains exactly one element.
(2) contains exactly two elements.
(3) contains exactly four elements.
(4) is an empty set.
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