Ответ: \[(4x - 3)(4x + 3) - (4x - 1)^{2} = 3x\] \[16x^{2} - 9 - 16x^{2} + 8x - 1 = 3x\] \[8x - 3x = 10\] \[5x = 10\] \[x = 2.\]