9x² - 1 = (3x + 1)(2x - 3)

9x²-1=(3x+1)(2x-3)
2(9x²+6x+1)=(3x+1)(x-2)
27x ²(x+3)-12(x²+3x) =0
16x²-8x+1=4(x+3)(4x-1)