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