7. \(11\frac{7}{20}-6\frac{17}{20}\)

\[11\frac{7}{20}-6\frac{17}{20}=10\frac{27}{20}-6\frac{17}{20}=4\frac{10}{20}=4\frac{1}{2}.\]

Ответ: \(4\frac{1}{2}\).