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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)
1/(x-2) = 2 // - 2
1/(x-2)-2 = 0
1/(x-2)+(-2*(x-2))/(x-2) = 0
1-2*(x-2) = 0
5-2*x = 0
(5-2*x)/(x-2) = 0
(5-2*x)/(x-2) = 0 // * x-2
5-2*x = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x = 5/2
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