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=5x²-3x²-3x+5+7-9
=2x²-3x+12-9
=2x²-3x+3
2. (2x-1) (3x+4)
=6x²+8x-3x-4
=6x²+5x-4
=6*+8*-3*-4
=6*+5*-4