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D( x )
6*x-9 = 0
6*x-9 = 0
6*x-9 = 0
6*x-9 = 0 // + 9
6*x = 9 // : 6
x = 9/6
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
(18-(12*x))/(6*x-9) = 0
(18-12*x)/(6*x-9) = 0
18-12*x = 0 // - 18
-12*x = -18 // : -12
x = -18/(-12)
x = 3/2
x in { 3/2}
x belongs to the empty set
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