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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)
(1/(x-3))*(x-2)-((1/(x-3))*(X-1)) = 0
(1/(x-3))*(x-2)-((x-3)^-1*(X-1)) = 0
(1*(x-2))/(x-3)+(-1*(X-1))/(x-3) = 0
1*(x-2)-1*(X-1) = 0
x-X-1 = 0
(x-X-1)/(x-3) = 0
(x-X-1)/(x-3) = 0 // * x-3
x-X-1 = 0
x-X-1 = 0 // + -X-1
x = -(-X-1)
x = X+1
x = X+1
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