\[(3x - 1)^{2} - 9x^{2} = 10\]
\[9x^{2} - 6x + 1 - 9x^{2} = 10\]
\[- 6x = 9\]
\[x = - \frac{9}{6} = - 1,5.\]
\[Ответ:x = - 1,5.\]