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OpenStudy (anonymous):
\[\frac{ 7 }{ 9} - \frac{ 1 }{ 12 } = \frac{ 4 }{ 4 } * \frac{ 7 }{ 9 } - \frac{ 3 }{ 3} * \frac{ 1 }{ 12} = \frac{ 28 }{ 36 } - \frac{ 3 }{ 36 } = \frac{ 25 }{ 36 }\]
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