\[ 0,8x - 1,4x = -2,6 - 1,4 \]
\[ -0,6x = -4 \]
\[ x = \frac{-4}{-0,6} \]
\[ x = \frac{4}{0,6} \]
\[ x = \frac{40}{6} \]
\[ x = \frac{20}{3} \]
Ответ: \[ x = \frac{20}{3} \]