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[" If "(x^(2)+x+1)+(x^(2)+2x+3)+(x^(2)+3...

[" If "(x^(2)+x+1)+(x^(2)+2x+3)+(x^(2)+3x+5)],[+...+(x^(2)+20x+39)=4500" ,then "x" is equal to "],[[" (A) "10," (B) "-10],[" (C) "20.5," (D) "-20.5]]

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