Решим уравнение:
$$ -5x(x - 2) +5(x + 1)^2 = -1 $$
$$ -5x^2 + 10x + 5(x^2 + 2x + 1) = -1 $$
$$ -5x^2 + 10x + 5x^2 + 10x + 5 = -1 $$
$$ 20x + 5 = -1 $$
$$ 20x = -6 $$
$$ x = -\frac{6}{20} = -\frac{3}{10} = -0.3 $$
Ответ: -0.3