Answer
$\frac{19}{45}$.
Work Step by Step
$\frac{8}{9} - \frac{7}{15} = \frac{8 \cdot 5}{9 \cdot 5} - \frac{7 \cdot 3}{15 \cdot 3} = \frac{40}{45} - \frac{21}{45} = \frac{40-21}{45} = \frac{19}{45}$.
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