\(\frac{5}{6} - \frac{4}{9} = \frac{5 \cdot 3}{6 \cdot 3} - \frac{4 \cdot 2}{9 \cdot 2} = \frac{15}{18} - \frac{8}{18} = \frac{7}{18}\)
\(\frac{7}{18} \cdot 18 = 7\)
Ответ: 7