\[\boxed{\text{468\ (468).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[2ax - 6x - 2a + 6 = 0\]
\[2ax - 6x = 2a - 6\]
\[2x \cdot (a - 3) = 2 \cdot (a - 3)\]
\[a - 3 = 0\]
\[\ \ \ \ \ \ \ \ a = 3\]
\[0 = 0 - бесконечно\ много.\]
\[Ответ:при\ a = 3.\]
\[- 4a - 6ax - 9a - 6 = 0\]
\[- 2x \cdot (2 + 3a) = 3 \cdot (3a + 2)\]
\[3a + 2 = 0\]
\[\ \ \ \ \ \ \ \ \ \ \ a = - \frac{2}{3}\]
\[0 = 0 - бесконечно\ много.\]
\[Ответ:\ при\ a = - \frac{2}{3}\text{.\ \ }\]