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[tex] \frac{3}{r} = \frac{9}{12} [/tex]
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Step-by-step explanation:

[tex] \frac{3}{r} = \frac{9}{12} [/tex]

[tex]9r = 36[/tex]

[tex] \frac{9r}{9} = \frac{36}{9} [/tex]

[tex]r \: = 4[/tex]

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