\"\"

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The expression is \"\".

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\"\"                           (12 can be written as \"\")

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Divide by a fraction, multiply by its multiplicative inverse.

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So, \"\", where \"\".

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\"\"\"\"

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If \"\", where b,d \"\".

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\"\"

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\"\"                             (Multiply numerator: \"\")

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\"\"                             (Multiply denominator: \"\")

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\"\"                                  (Divide: \"\")\"\"

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The simplest form is \"\".