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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+3)/(x-1) = 7 // - 7
(5*x+3)/(x-1)-7 = 0
(5*x+3)/(x-1)+(-7*(x-1))/(x-1) = 0
5*x-7*(x-1)+3 = 0
10-2*x = 0
(10-2*x)/(x-1) = 0
(10-2*x)/(x-1) = 0 // * 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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