(3x - 1)(4x + 5) - (2x + 3)(6x + 1) = 4
12x² + 15x - 4x - 5 - 12x² - 2x - 18x -3 = 4
11x - 20x = 4 + 8
-9x = 12
x = -12/9 = -4/3
(3x - 1)(4x + 5) - (2x + 3)(6x + 1) = 4
12x² + 15x - 4x - 5 - 12x² - 2x - 18x -3 = 4
11x - 20x = 4 + 8
-9x = 12
x = -12/9 = -4/3