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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)-(4/(x-1)) = 0
2/(x-3)-4*(x-1)^-1 = 0
2/(x-3)-4/(x-1) = 0
(2*(x-1))/((x-3)*(x-1))+(-4*(x-3))/((x-3)*(x-1)) = 0
2*(x-1)-4*(x-3) = 0
10-2*x = 0
(10-2*x)/((x-3)*(x-1)) = 0
(10-2*x)/((x-3)*(x-1)) = 0 // * (x-3)*(x-1)
10-2*x = 0
10-2*x = 0 // - 10
-2*x = -10 // : -2
x = -10/(-2)
x = 5
x = 5
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