\[a - x \leq 2 - ax\]
\[- x + ax \leq 2 - a\]
\[x(a - 1) \leq 2 - a\]
\[a = 1,\]
\[0 \cdot x \leq 1 \Longrightarrow ( - \infty;\ + \infty)\]
\[a < 1,\ \ x \geq \frac{2 - a}{a - 1}\]
\[a > 1,\ \ x \leq \frac{2 - a}{a - 1}.\]