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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
1/(x-5) = 2 // - 2
1/(x-5)-2 = 0
1/(x-5)+(-2*(x-5))/(x-5) = 0
1-2*(x-5) = 0
11-2*x = 0
(11-2*x)/(x-5) = 0
(11-2*x)/(x-5) = 0 // * x-5
11-2*x = 0
11-2*x = 0 // - 11
-2*x = -11 // : -2
x = -11/(-2)
x = 11/2
x = 11/2
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