\[- 2 \cdot (2,7x - 1) - (6 - 3,4x) + 8 \cdot (0,4x - 2) =\]
\[= - 5,4x + 2 - 6 + 3,4x + 3,2x - 16 =\]
\[= 1,2x - 20\]
\[x = - \frac{5}{6}:\]
\[1,2 \cdot \left( - \frac{5}{6} \right) - 20 = - 0,2 \cdot 5 - 20 =\]
\[= - 1 - 20 = - 21.\]