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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
(39*x-13)/(3*x-1) = 0
39*x-13 = 0 // + 13
39*x = 13 // : 39
x = 13/39
x = 1/3
x in { 1/3}
x belongs to the empty set
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