(x+1)(x+2)(3x-1)(3x-4)+12
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x (x+2)+1(x+2) 3x(3x-4)-1(3x-4)+12
x²+2x+x+2 X 3x²-12x-3x+4+12
x²+3x+2 X 3x²-9x+4+12
x²+3x+2X3x²-9x+16
4x²-6x+18
divide by two
2x²-3x+9
x²+2x+x+2 X 3x²-12x-3x+4+12
x²+3x+2 X 3x²-9x+4+12
x²+3x+2X3x²-9x+16
4x²-6x+18
divide by two
2x²-3x+9
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