x = 5/39
Объяснение:
(2x – 3)² + 7x(3x – 1) = (5x + 2)²
4x² – 12x + 9 + 21x² – 7x = 25x² + 20x + 4
4x² – 12x + 9 + 21x² – 7x – 25x² – 20x – 4 = 0
–39x + 5 = 0
39x = 5
