\[3 \cdot (x - 2) - ax = 1\]
\[3x - 6 - ax = 1\]
\[3x - ax = 6 + 1\]
\[x(3 - a) = 7\]
\[x = \frac{7}{3 - a}\]
\[Ответ:x = \frac{7}{3 - a}.\]