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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(x^2+x-6)/(x-2) = x // - x
(x^2+x-6)/(x-2)-x = 0
(x^2+x-6)/(x-2)+(-x*(x-2))/(x-2) = 0
x^2-x*(x-2)+x-6 = 0
3*x-6 = 0
(3*x-6)/(x-2) = 0
(3*x-6)/(x-2) = 0 // * x-2
3*x-6 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x in { 2}
x belongs to the empty set
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