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