Зная, что (m+3)/n=2, найдите (m-5n)/m.

\[\frac{m + 3n}{n} = 2\]

\[\frac{m}{n} + \frac{3n}{n} = 2\]

\[\frac{m}{n} + 3 = 2\]

\[\frac{m}{n} = - 1 \rightarrow \frac{n}{m} = - 1.\]

\[\frac{m - 5n}{m} = \frac{m}{m} - \frac{5n}{m} = 1 - 5 \cdot \frac{n}{m} =\]

\[= 1 + 5 = 6.\]

\[Ответ:6.\]