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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)
x/(x-5)-5 = 5/(x-5) // - 5/(x-5)
x/(x-5)-(5/(x-5))-5 = 0
x/(x-5)-5*(x-5)^-1-5 = 0
x/(x-5)-5/(x-5)-5 = 0
x/(x-5)-5/(x-5)+(-5*(x-5))/(x-5) = 0
x-5*(x-5)-5 = 0
x-5*x-5+25 = 0
20-4*x = 0
(20-4*x)/(x-5) = 0
(20-4*x)/(x-5) = 0 // * x-5
20-4*x = 0
20-4*x = 0 // - 20
-4*x = -20 // : -4
x = -20/(-4)
x = 5
x in { 5}
x belongs to the empty set
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