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