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