\[7,2x - 5,4x + 0,55 = 1\]
\[1,8x = 1 - 0,55\]
\[1,8x = 0,45\]
\[x = 0,45\ :1,8 = 45\ :180\]
\[x = 0,35\]
\[Ответ:0,35.\]