\[\boxed{\text{961.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ (2 - 2n) - (5n - 27) > 0\]
\[2 - 2n - 5n + 27 > 0\]
\[- 7n > 29\]
\[n < - \frac{29}{7}\]
\[n \in \left( - \infty;\ - \frac{29}{7} \right)\]
\[Ответ:n = 1;2;3;4.\]
\[\textbf{б)}\ ( - 27,1 + 3n) + (7,1 + 5n) < 0\]
\[- 27,1 + 3n + 7,1 + 5n < 0\]
\[8n < 20\]
\[n < \frac{20}{8}\]
\[n < 2,5\]
\[n \in ( - \infty;2,5)\]
\[Ответ:n = 1;2.\]