Решите уравнение: x-(2x+3)=6x-(4x-8).

\[x - (2x + 3) = 6x - (4x - 8)\]

\[x - 2x - 3 = 6x - 4x + 8\]

\[- x - 2x = 8 + 3\]

\[- 3x = 11\]

\[x = - \frac{11}{3} = - 3\frac{2}{3}.\]