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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)
(5*x-1)/(x-2) = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x = 1/5
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