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D( x )
x = 0
5*x-5 = 0
x = 0
x = 0
5*x-5 = 0
5*x-5 = 0
5*x-5 = 0 // + 5
5*x = 5 // : 5
x = 5/5
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
5/x = 25/(5*x-5) // - 25/(5*x-5)
5/x-(25/(5*x-5)) = 0
5/x-25*(5*x-5)^-1 = 0
5/x-25/(5*x-5) = 0
(-25*x)/(x*(5*x-5))+(5*(5*x-5))/(x*(5*x-5)) = 0
5*(5*x-5)-25*x = 0
-25 = 0
-25/(x*(5*x-5)) = 0
-25/(x*(5*x-5)) = 0 // * x*(5*x-5)
-25 = 0
x belongs to the empty set
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