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D( x )
x-2 = 0
x = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x = 0
x = 0
x in (-oo:0) U (0:2) U (2:+oo)
3/x = -6/(x-2) // + -6/(x-2)
3/x-(-6/(x-2)) = 0
6*(x-2)^-1+3/x = 0
6/(x-2)+3/x = 0
(6*x)/(x*(x-2))+(3*(x-2))/(x*(x-2)) = 0
3*(x-2)+6*x = 0
9*x-6 = 0
(9*x-6)/(x*(x-2)) = 0
(9*x-6)/(x*(x-2)) = 0 // * x*(x-2)
9*x-6 = 0
9*x-6 = 0 // + 6
9*x = 6 // : 9
x = 6/9
x = 2/3
x = 2/3
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