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D( x )
5*x-2 = 0
5*x-2 = 0
5*x-2 = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
x in (-oo:2/5) U (2/5:+oo)
(x-1)/(5*x-2) = 0
x-1 = 0 // + 1
x = 1
x = 1
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