\[\boxed{\mathbf{1167\ (1159)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 5ax = 14 - x\]
\[x = 4:\]
\[5a \cdot 4 = 14 - 4\]
\[20a = 10\]
\[a = 0,5\]
\[Ответ:при\ a = 0,5.\]
\[2)\ (2a + 1)x = - 6a + 2x - 13\]
\[x = - 1:\]
\[(2a + 1) \cdot ( - 1) =\]
\[= - 6a + 2 \cdot ( - 1) - 13\]
\[- 2a - 1 = - 6a - 2 - 13\]
\[- 2a + 6a = - 15 + 1\]
\[4a = - 14\]
\[a = - 3,5\]
\[Ответ:при\ a = - 3,5.\]