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D( x )
x^2-(2*x) = 0
x^2-(2*x) = 0
x^2-(2*x) = 0
x^2-2*x = 0
x^2-2*x = 0
DELTA = (-2)^2-(0*1*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+2)/(1*2) or x = (2-4^(1/2))/(1*2)
x = 2 or x = 0
x in (-oo:0) U (0:2) U (2:+oo)
(2*x^3-(4*x^2))/(x^2-(2*x)) = 0
(2*x^3-4*x^2)/(x^2-2*x) = 0
2*x^3-4*x^2 = 0
2*x^2*(x-2) = 0
x-2 = 0 // + 2
x = 2
2*x^2*(x-2) = 0
x^2-2*x = 0
x*(x-2) = 0
x-2 = 0 // + 2
x = 2
x*(x-2) = 0
(2*x^2*(x-2))/(x*(x-2)) = 0
( 2*x^2 )
2*x^2 = 0 // : 2
x^2 = 0
x = 0
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 0}
x in { 2}
x belongs to the empty set
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