\[x² - 2ax + 2a^{2} - 2a + 1 = 0\]
\[D = 4a^{2} - 8a^{2} + 8a - 4 =\]
\[= - 4a^{2} + 8a - 4 =\]
\[= - 4 \cdot \left( a^{2} - 2a + 1 \right) =\]
\[= - 4 \cdot (a - 1)²\]
\[- 4 \cdot (a - 1)^{2} < 0;\ \ \ \ \ \ a \neq 1\]
\[Ответ:( - \infty;1) \cup (1;\ + \infty).\]