(4x+1)(3x-2)=(6x+1)(2x+3)-4x
(4x+1)(3x-2)=(6x+1)(2x+3)-4x 12x²-8x+3x-2=12x²+18x+2x+3-4x 12x²-8x+3x-12x²-18x-2x+4x=3+2 -21x=5|:(-21) x=-5/21