7. \(\frac{15}{4}\cdot\frac{7}{3}\)

Сократим 15 и 3: \(\frac{15}{3}=5\).

\(\frac{15}{4}\cdot\frac{7}{3}=\frac{35}{4}=8\frac{3}{4}\).

Ответ: \(\frac{35}{4}=8\frac{3}{4}\)