\[18 - 2x = 3 - 6 \cdot (x - 2)\]
\[18 - 2x = 3 - 6x + 12\]
\[- 2x + 6x = 15 - 18\]
\[4x = - 3\]
\[x = - \frac{3}{4}\]
\[x = - 0,75.\]
\[Ответ:\ - 0,75.\]