Answer:

[tex] \frac{ - 5}{6} + \frac{7}{ - 9} \\ = \frac{ - 5}{6} - \frac{7}{9} \\ = ( - \frac{ 5}{6} \times \frac{3}{3}) - (\frac{7}{9} \times \frac{2}{2}) \\ = - \frac{ 15}{18} - \frac{14}{18} \\ = \frac{ - 15 - 14}{18} \\ = - \frac{29}{18} [/tex]

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