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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)
2/(x-5) = 2 // - 2
2/(x-5)-2 = 0
2/(x-5)+(-2*(x-5))/(x-5) = 0
2-2*(x-5) = 0
12-2*x = 0
(12-2*x)/(x-5) = 0
(12-2*x)/(x-5) = 0 // * x-5
12-2*x = 0
12-2*x = 0 // - 12
-2*x = -12 // : -2
x = -12/(-2)
x = 6
x = 6
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