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