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(2x-3)(2x-3)-3(3x-2)(3x-2)-(4x-1)(4x+1)
(4X²-6x-6x+9)-3(9x²-6x-6x+4)-(16x²+4x-4x-1)
(4x²-12x+9)-3(9x²-12x+4)-(16x²-1)
4x²-12x+9-27x²+36x-12-16x²+1
terminos comunes
R= -39x²+24x-2