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D( x )
x = 0
x-1 = 0
x = 0
x = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
3/(x-1) = 5/x // - 5/x
3/(x-1)-(5/x) = 0
3/(x-1)-5*x^-1 = 0
3/(x-1)-5/x = 0
(3*x)/(x*(x-1))+(-5*(x-1))/(x*(x-1)) = 0
3*x-5*(x-1) = 0
5-2*x = 0
(5-2*x)/(x*(x-1)) = 0
(5-2*x)/(x*(x-1)) = 0 // * x*(x-1)
5-2*x = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x = 5/2
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