\[\boxed{\mathbf{774\ (774)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\textbf{а)}\ x + 4 = - 1\]
\[x = - 1 - 4\]
\[x = - 5\]
\[Подстановка:\ - 5 + 4 = - 1 \Longrightarrow верно.\]
\[\textbf{б)}\ 5 - x = 10\]
\[10 + x = 5\]
\[x = 5 - 10\]
\[x = - 5\]
\[Подстановка:\ \ 5 - ( - 5) = 5 + 5 = 10 \Longrightarrow верно.\]
\[\textbf{в)}\ x - 7 = - 10\]
\[x = - 10 + 7\]
\[x = - 3\]
\[Подстановка:\ - 3 - 7 = - 3 + ( - 7) = - 10 \Longrightarrow верно.\]
\[\textbf{г)}\ x - ( - 4) = 0\]
\[x + 4 = 0\]
\[x = - 4\]
\[Подстановка:\ - 4 - ( - 4) = - 4 + 4 = 0 \Longrightarrow верно.\]