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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)
3 = (2*x-2)/(x-2) // - (2*x-2)/(x-2)
3-((2*x-2)/(x-2)) = 0
(-1*(2*x-2))/(x-2)+3 = 0
(-1*(2*x-2))/(x-2)+(3*(x-2))/(x-2) = 0
3*(x-2)-1*(2*x-2) = 0
x-4 = 0
(x-4)/(x-2) = 0
(x-4)/(x-2) = 0 // * x-2
x-4 = 0
x-4 = 0 // + 4
x = 4
x = 4
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