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-3x²-8(-(4x²+5x-x²+x-6))
-3x²-8(-(4x²-x²+5x+x-6))
-3x²-8(-(3x²+6x-6))
-3x²-8(-3x²-6x+6)
-3x²+24x²+48x-48
21x²+48x-48
3(7x²+16x-16) sacando factor comun.