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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)
5/(x-1) = 10 // - 10
5/(x-1)-10 = 0
5/(x-1)+(-10*(x-1))/(x-1) = 0
5-10*(x-1) = 0
15-10*x = 0
(15-10*x)/(x-1) = 0
(15-10*x)/(x-1) = 0 // * x-1
15-10*x = 0
15-10*x = 0 // - 15
-10*x = -15 // : -10
x = -15/(-10)
x = 3/2
x = 3/2
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