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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)
1 = 15/(x-2) // - 15/(x-2)
1-(15/(x-2)) = 0
1-15*(x-2)^-1 = 0
1-15/(x-2) = 0
(1*(x-2))/(x-2)-15/(x-2) = 0
1*(x-2)-15 = 0
x-17 = 0
(x-17)/(x-2) = 0
(x-17)/(x-2) = 0 // * x-2
x-17 = 0
x-17 = 0 // + 17
x = 17
x = 17
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