\[x^{2} + bx + c = 0\]
\[\left( x + \frac{1}{5} \right)(x - 2) = 0\]
\[x^{2} + \frac{1}{5}x - 2x - \frac{2}{5} = 0\]
\[x^{2} + 1\frac{4}{5}x - \frac{2}{5} = 0\]
\[x^{2} + \frac{9}{5}x - \frac{2}{5} = 0\ \ \ | \cdot 5\]
\[Уравнение:\]
\[5x^{2} + 9x - 2 = 0.\]