[ Answer ]
[tex]\boxed{One \ Solution}[/tex]
[ Explanation ]
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[tex](\sqrt{x} )^{2}[/tex] = [tex]9^{2}[/tex]
[tex](\sqrt{x} )^{2}[/tex]: x
[tex]9^{2}[/tex]: 81
X = 81
X = 81 (True)
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There is one answer therefore there is One Solution
[tex]\boxed{[ \ Eclipsed \ ]}[/tex]