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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-4)/(x-5) = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x = 2
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