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D( x )
6*x-2 = 0
6*x-2 = 0
6*x-2 = 0
6*x-2 = 0 // + 2
6*x = 2 // : 6
x = 2/6
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
(3*x-1)/(6*x-2) = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in { 1/3}
x belongs to the empty set
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