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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)
9/(x-2)+5 = 0.5 // - 0.5
9/(x-2)-0.5+5 = 0
9/(x-2)+(-0.5*(x-2))/(x-2)+(5*(x-2))/(x-2) = 0
5*(x-2)-0.5*(x-2)+9 = 0
5*x-0.5*x-10+10 = 0
4.5*x = 0
(4.5*x)/(x-2) = 0
(4.5*x)/(x-2) = 0 // * x-2
4.5*x = 0
4.5*x = 0 // : 4.5
x = 0
x = 0
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