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