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D( x )
3*x = 0
x-1 = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
9/(3*x) = 2/(x-1) // - 2/(x-1)
9/(3*x)-(2/(x-1)) = 0
9/(3*x)-2*(x-1)^-1 = 0
3/x-2/(x-1) = 0
(-2*x)/(x*(x-1))+(3*(x-1))/(x*(x-1)) = 0
3*(x-1)-2*x = 0
x-3 = 0
(x-3)/(x*(x-1)) = 0
(x-3)/(x*(x-1)) = 0 // * x*(x-1)
x-3 = 0
x-3 = 0 // + 3
x = 3
x = 3
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