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[" 13.If the roots of the equation "],[[...

[" 13.If the roots of the equation "],[[(a-b)x^(2)+(b-c)x+c-a=0," are equal,then "],[" (a) "2a=b-c," (b) "2a=c-b],[" (c) "2a=b+c," (d) "2b=a+c]]

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