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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)
9/(x-3) = (3*x)/(x-3) // - (3*x)/(x-3)
9/(x-3)-((3*x)/(x-3)) = 0
9/(x-3)-3*x*(x-3)^-1 = 0
9/(x-3)+(-3*x)/(x-3) = 0
9-3*x = 0
(9-3*x)/(x-3) = 0
(9-3*x)/(x-3) = 0 // * x-3
9-3*x = 0
9-3*x = 0 // - 9
-3*x = -9 // : -3
x = -9/(-3)
x = 3
x in { 3}
x belongs to the empty set
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