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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)
4/(x-1)-(3/(x-3)) = 0
4/(x-1)-3*(x-3)^-1 = 0
4/(x-1)-3/(x-3) = 0
(4*(x-3))/((x-1)*(x-3))+(-3*(x-1))/((x-1)*(x-3)) = 0
4*(x-3)-3*(x-1) = 0
x-9 = 0
(x-9)/((x-1)*(x-3)) = 0
(x-9)/((x-1)*(x-3)) = 0 // * (x-1)*(x-3)
x-9 = 0
x-9 = 0 // + 9
x = 9
x = 9
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