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