from the sum of 5x²+x+2 and -2x+3x²+4 subtract x-x²-1
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Sum:-(5x²+x+2)+(3x²-2x+4)
=5x²+3x²+x-2x+2+4
=8x²-x+6
Subtract:- (8x²-x+6)-(-x²+x-1)
=8x²+x²-x-x+6+1
=9x²-2x+7
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