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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)
(x-1)/(x-3) = 4 // - 4
(x-1)/(x-3)-4 = 0
(x-1)/(x-3)+(-4*(x-3))/(x-3) = 0
x-4*(x-3)-1 = 0
11-3*x = 0
(11-3*x)/(x-3) = 0
(11-3*x)/(x-3) = 0 // * x-3
11-3*x = 0
11-3*x = 0 // - 11
-3*x = -11 // : -3
x = -11/(-3)
x = 11/3
x = 11/3
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