\[\boxed{\mathbf{790\ (790)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ 25 \bullet x = - 25\]
\[x = - 25\ :25\]
\[x = - 1.\]
\[Ответ:x = - 1.\]
\[\textbf{б)}\ x \bullet ( - 18) = 0\]
\[x = 0\ :( - 18)\]
\[x = 0.\]
\[Ответ:x = 0.\]
\[\textbf{в)}\ x \bullet ( - 30) = 30\]
\[x = 30\ :( - 30)\]
\[x = - 1.\]
\[Ответ:x = - 1.\]
\[\textbf{г)} - 19x = 19\]
\[x = 19\ :( - 19)\]
\[x = - 1.\]
\[Ответ:x = - 1.\]
\[\textbf{д)}\ x\ :1 = - 7\]
\[x = - 7 \bullet 1\]
\[x = - 7.\]
\[Ответ:x = - 7.\]
\[\textbf{е)} - 26\ :x = 26\]
\[26 \bullet x = - 26\]
\[x = - 26\ :26\]
\[x = - 1.\]
\[Ответ:x = - 1.\]
\[\textbf{ж)}\ x\ :( - 8) = 0\]
\[x = 0 \bullet ( - 8)\]
\[x = 0.\]
\[Ответ:x = 0.\]
\[\textbf{з)}\ x\ :( - 1) = - 1\]
\[x = - 1 \bullet ( - 1)\]
\[x = 1.\]
\[Ответ:x = 1.\]