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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(3*x-9)/(x-2) = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x = 3
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