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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)
2/(x-2)+x/(x-2) = 0
x+2 = 0
(x+2)/(x-2) = 0
(x+2)/(x-2) = 0 // * x-2
x+2 = 0
x+2 = 0 // - 2
x = -2
x = -2
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