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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)-2 = 0
(x+5)/(x-1)+(-2*(x-1))/(x-1) = 0
x-2*(x-1)+5 = 0
7-x = 0
(7-x)/(x-1) = 0
(7-x)/(x-1) = 0 // * x-1
7-x = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x = 7
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