Решение:
\[ 3x^2 - x^2 - 5x - 3x + 7 - 1 = 0 \]
\[ 2x^2 - 8x + 6 = 0 \]
\[ x^2 - 4x + 3 = 0 \]
\[ D = (-4)^2 - 4 \cdot 1 \cdot 3 = 16 - 12 = 4 \]
\[ x_1 = \frac{4 - \sqrt{4}}{2 \cdot 1} = \frac{4 - 2}{2} = \frac{2}{2} = 1 \]
\[ x_2 = \frac{4 + \sqrt{4}}{2 \cdot 1} = \frac{4 + 2}{2} = \frac{6}{2} = 3 \]
Ответ: 1, 3