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D( x )
x^3-x^2 = 0
x^3-x^2 = 0
x^3-x^2 = 0
x^3-x^2 = 0
x^2*(x-1) = 0
x-1 = 0 // + 1
x = 1
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:1) U (1:+oo)
(5*x^2)/(x^3-x^2) = 0
x^3-x^2 = 0
x^2*(x-1) = 0
x-1 = 0 // + 1
x = 1
x^2*(x-1) = 0
(5*x^2)/(x^2*(x-1)) = 0
5*x^2 = 0 // : 5
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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