1.

Divide the sum of -13/5and12/7 by there difference​

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( \frac{ - 13}{5} + \frac{12}{7}) \div ( \frac{ - 13}{5} - \frac{12}{7} )

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( \frac{ - 13}{5} + \frac{12}{7}) \div ( \frac{ - 13}{5} - \frac{12}{7} ) \\ = (\frac{ - 91 + 60}{35} ) \div ( \frac{ - 91 - 60}{35} ) \\ = \frac{ - 31}{35} \div \frac{ - 151}{35} \\ = \frac{ - 31}{35} \times \frac{35}{ - 151} \\ = \frac{ - 31}{ - 151} \\ = \frac{31}{151}

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