97. Решите уравнение: 1) 3x(x - 7) - x(4 + 3x) = 5; 2) 5x - x² + 3 = x(2 - x);

Решение:

1. \( 3x(x - 7) - x(4 + 3x) = 5 \)
   \( 3x^2 - 21x - 4x - 3x^2 = 5 \)
   \( -25x = 5 \)
   \( x = \frac{5}{-25} \)
   \( x = -0.2 \)
2. \( 5x - x^2 + 3 = x(2 - x) \)
   \( 5x - x^2 + 3 = 2x - x^2 \)
   \( 5x + 3 = 2x \)
   \( 5x - 2x = -3 \)
   \( 3x = -3 \)
   \( x = -1 \)

Ответ: 1) \( -0.2 \); 2) \( -1 \).