\[\frac{x - 3}{1,1} = \frac{x + 3}{2,6}\]
\[2,6(x - 3) = 1,1(x + 3)\]
\[2,6x - 7,8 = 1,1x + 3,3\]
\[1,5x = 11,1\]
\[x = \frac{111}{15} = \frac{37}{5} = \frac{74}{10}\]
\[x = 7,4.\]