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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)
(x+13)/(x-2)+1 = 15/(x-2) // - 15/(x-2)
(x+13)/(x-2)-(15/(x-2))+1 = 0
(x+13)/(x-2)-15*(x-2)^-1+1 = 0
(x+13)/(x-2)-15/(x-2)+1 = 0
(x+13)/(x-2)-15/(x-2)+(1*(x-2))/(x-2) = 0
1*(x-2)+x-15+13 = 0
x+x-2-2 = 0
2*x-4 = 0
(2*x-4)/(x-2) = 0
(2*x-4)/(x-2) = 0 // * x-2
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in { 2}
x belongs to the empty set
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