(3х+4)(4х–3) – 17=(2х+3)(6х+7.
(3x + 4)(4x - 3) - 17 = (2x + 3)(6x + 7) 12x² - 9x + 16x - 12 - 17 = 12x² + 14x + 18x + 21 7x - 29 = 32x + 21 7x - 32x = 21 + 29 -25x = 50 x = -2 Ответ: x = -2.