\[\boxed{\text{58\ (58).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ nx = - 5\]
\[x = - \frac{5}{n}\]
\[n = - 5;\ \ n = - 1\]
\[Ответ:\ n = - 5;\ - 1.\]
\[2)\ (n - 6) \cdot x = 25\]
\[x = \frac{25}{n - 6}\]
\[n - 6 = 25 \Longrightarrow \ \ n = 31\]
\[n - 6 = 5 \Longrightarrow \ \ n = 11\]
\[n - 6 = 1 \Longrightarrow \ \ n = 7\]
\[Ответ:n = 31;11;7.\]