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