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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x^2-(2/x) = 6*x-(2/x) // - 6*x-(2/x)
3*x^2-(6*x)-(2/x)+2/x = 0
3*x^2-6*x-2*x^-1+2/x = 0
3*x^2-6*x = 0
DELTA = (-6)^2-(0*3*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+6)/(2*3) or x = (6-36^(1/2))/(2*3)
x = 2 or x = 0
x in { 0}
x = 2
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