(5x²+6x-3)-(2x²-3x-4)=5x²+6x-3-2x²+3x+4=3x²+6x-3+3x+4=3x²+9x-3+4=3x²+9x+1
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(5x²+6x-3)-(2x²-3x-4)=5x²+6x-3-2x²+3x+4=3x²+6x-3+3x+4=3x²+9x-3+4=3x²+9x+1