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D( x )
18*x-9 = 0
18*x-9 = 0
18*x-9 = 0
18*x-9 = 0 // + 9
18*x = 9 // : 18
x = 9/18
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(12*x-6)/(18*x-9) = 0
12*x-6 = 0 // + 6
12*x = 6 // : 12
x = 6/12
x = 1/2
x in { 1/2}
x belongs to the empty set
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