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