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