§ Задание 268
\[\boxed{\text{268.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[x = 760 - 290\]
\[x = 470.\]

\[x = 540 - 260\]
\[x = 280.\]

\[x = 600 - 370\]
\[x = 230.\]

\[x = 900 - 850\]
\[x = 50.\ \]
\[\boxed{\text{268.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[x = 760 - 290\]
\[x = 470.\]

\[x = 540 - 260\]
\[x = 280.\]

\[x = 600 - 370\]
\[x = 230.\]

\[x = 900 - 850\]
\[x = 50.\ \]