\[4 \cdot (x - 3) - ax = 2\]
\[4x - 12 - ax = 2\]
\[4x - ax = 12 + 2\]
\[x(4 - a) = 14\]
\[x = \frac{14}{4 - a}\]
\[Ответ:x = \frac{14}{4 - a}.\]