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