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D( x )
x-3 = 0
x-1 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:3) U (3:+oo)
x/(x-3) = (x+3)/(x-1) // - (x+3)/(x-1)
x/(x-3)-((x+3)/(x-1)) = 0
x/(x-3)+(-1*(x+3))/(x-1) = 0
(x*(x-1))/((x-3)*(x-1))+(-1*(x+3)*(x-3))/((x-3)*(x-1)) = 0
x*(x-1)-1*(x+3)*(x-3) = 0
9-x = 0
(9-x)/((x-3)*(x-1)) = 0
(9-x)/((x-3)*(x-1)) = 0 // * (x-3)*(x-1)
9-x = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
x = 9
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