number of real roots of equation x-1^2+x-2^2+x-3^2=0
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(x-1)^2+(x-2)^2+(x-3)^2=0
3x^2 - 12x + 12 =0
3x^2 - 6x - 6x + 12 = 0
(3x -6) (x-2) = 0
x = 2,2
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