\[a - 2x < 1 + ax\]
\[- 2x - ax < 1 - a\]
\[x( - 2 - a) < 1 - a\]
\[a = - 2 \Longrightarrow \ \ 0 \cdot x < 3,\ ( - \infty; + \infty)\ \]
\[a < - 2 \Longrightarrow x < \frac{1 - a}{- 2 - a}\]
\[a > - 2 \Longrightarrow x > \frac{1 - a}{- 2 - a}\ \]