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x² -4x+4-3(x-4)(x+4) -2(4x²+4x+1)=
x²-4x+4-3(x²-16)-8x²-8x-2=
x²-4x+4-3x²+48-8x²-8x-2=
-10x²-12x+50=
-2(5x²+6x-25)