3. Решите уравнение: A) (2x - 5)(5x + 4) – 10x² = 14; Б) (4у + 3)(3у + 1) = (2y - 1)(6y + 5) – 1.

A) 10x² + 8x - 25x - 20 - 10x² = 14 => -17x - 20 = 14 => -17x = 34 => x = -2
Б) 12y² + 4y + 9y + 3 = 12y² + 10y - 6y - 5 - 1 => 12y² + 13y + 3 = 12y² + 4y - 6 => 13y + 3 = 4y - 6 => 9y = -9 => y = -1