from the sum of 5 x square - 7 x + 4 and minus 3 X square + 5 x + two subtract X square + X + 1
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it not an english question
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{(5x²-7x+4)+(3x²+5x+2)}-(x²+x+1)
={5x²-7x+4+3x²+5x+2}-x²-x-1
={8x²-2x+6}-x²-x-1
=8x²-2x+6-x²-x-1
=7x²-x+5
={5x²-7x+4+3x²+5x+2}-x²-x-1
={8x²-2x+6}-x²-x-1
=8x²-2x+6-x²-x-1
=7x²-x+5
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