(3x-2)(3x-2y+1)-4x(2x-3y+1)=
(3x-2)(3x-2y+1)-4x(2x-3y+1)=9x-6xy+3x-6x-4y+2-8x²+12xy-4x=9x+3x-6x-4x-6xy+12xy-8x²=2x-18xy-8x²
(3x-2)(3x-2y+1)-4x(2x-3y+1)= 9x²-6xy+3x-6x+4y-2-8x²+12xy-4x = x²+6xy-7x+4y
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(3x-2)(3x-2y+1)-4x(2x-3y+1)=9x-6xy+3x-6x-4y+2-8x²+12xy-4x=9x+3x-6x-4x-6xy+12xy-8x²=2x-18xy-8x²
(3x-2)(3x-2y+1)-4x(2x-3y+1)= 9x²-6xy+3x-6x+4y-2-8x²+12xy-4x = x²+6xy-7x+4y