5. Решите уравнение: (3х – 5)(2х + 7) = (3x + 1)(2x-3) + 4x.

Решение: ((3x - 5)(2x + 7) = (3x + 1)(2x - 3) + 4x) (6x^2 + 21x - 10x - 35 = 6x^2 - 9x + 2x - 3 + 4x) (6x^2 + 11x - 35 = 6x^2 - 3x - 3) (11x + 3x = 35 - 3) (14x = 32) (x = \frac{32}{14} = \frac{16}{7}) Ответ: (x = \frac{16}{7})