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[tex]\\ \sf\longmapsto 9^y=3[/tex]
[tex]\\ \sf\longmapsto (3^2)^y=3^1[/tex]
[tex]\\ \sf\longmapsto 3^{2y}=3^1[/tex]
[tex]\\ \sf\longmapsto 2y=1[/tex]
[tex]\\ \sf\longmapsto y=\dfrac{1}{2}[/tex]