[tex] \frac{3}{12} = \frac{9}{x} \\ \\ 3x = 108 \\ x = \frac{108}{3} = 36[/tex]
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[tex] \frac{3}{12} = \frac{9}{x} \\ \\ 3x = 108 \\ x = \frac{108}{3} = 36[/tex]