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D( x )
6*x-18 = 0
6*x-18 = 0
6*x-18 = 0
6*x-18 = 0 // + 18
6*x = 18 // : 6
x = 18/6
x = 3
x in (-oo:3) U (3:+oo)
(9*x-27)/(6*x-18) = 0
9*x-27 = 0 // + 27
9*x = 27 // : 9
x = 27/9
x = 3
x in { 3}
x belongs to the empty set
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