化简3(2x+1)(2x-1)-4(3x-2)(-3x+2)

3(2x+1)(2x-1)-4(3x-2)(-3x+2)
=3(4x^2-1)+4(3x-2)^2
=12x^2-3+4(9x^2-12x+4)
=12x^2-3+36x^2-48x+16
=48x^2-48x+13

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