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D( x )
5*x-10 = 0
5*x-10 = 0
5*x-10 = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
x in (-oo:2) U (2:+oo)
(5*x-25)/(5*x-10) = 0
5*x-25 = 0 // + 25
5*x = 25 // : 5
x = 25/5
x = 5
x = 5
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