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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(x+5)/(x-1) = 4 // - 4
(x+5)/(x-1)-4 = 0
(x+5)/(x-1)+(-4*(x-1))/(x-1) = 0
x-4*(x-1)+5 = 0
9-3*x = 0
(9-3*x)/(x-1) = 0
(9-3*x)/(x-1) = 0 // * x-1
9-3*x = 0
9-3*x = 0 // - 9
-3*x = -9 // : -3
x = -9/(-3)
x = 3
x = 3
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