\[\boxed{\text{612\ (612).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[(2a - 3x)^{2} + (x - 1)^{2} =\]
\[= 10 \cdot (x - 2)(x + 2)\]
\[4a^{2} - 12ax + 9x^{2} + x^{2} - 2x + 1 =\]
\[= 10 \cdot \left( x^{2} - 4 \right)\]
\[- 2x - 12ax = - 4a^{2} - 41\]
\[- 2x \cdot (1 + 6a) = - 4a^{2} - 41\]
\[1 + 6a = 0\]
\[6a = - 1\ \ \]
\[a = - \frac{1}{6}\]
\[при\ \ a = - \frac{1}{6}\ уравнение\ \]
\[не\ имеет\ корней:\]
\[4 \cdot \left( - \frac{1}{6} \right) - 12x \cdot \left( - \frac{1}{6} \right) - 2x =\]
\[= - 41\]
\[- \frac{2}{3} + 2x - 2x = - 41\]
\[0x = - 41 + \frac{2}{3}\]
\[0 \neq - 40\frac{1}{3}\]
\[Ответ:\ при\ a = - \frac{1}{6}.\]