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[" If the two equations "x^(2)-cx],[+d=0...

[" If the two equations "x^(2)-cx],[+d=0" and "x^(2)-ax+b=0],[" have one common root and "],[" the second equation has "],[" equal roots,then "2(b+d)=],[0,0],[0" at "c],[0" ac "],[0" -ac "]

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