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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)
5/(x-5)+x = 5/(x-5)+5 // - 5/(x-5)+5
5/(x-5)-(5/(x-5))+x-5 = 0
5/(x-5)-5*(x-5)^-1+x-5 = 0
5/(x-5)-5/(x-5)+x-5 = 0
5/(x-5)-5/(x-5)+(x*(x-5))/(x-5)+(-5*(x-5))/(x-5) = 0
x*(x-5)-5*(x-5)-5+5 = 0
x^2-5*x-5*x+25 = 0
x^2-10*x+25 = 0
x^2-10*x+25 = 0
x^2-10*x+25 = 0
DELTA = (-10)^2-(1*4*25)
DELTA = 0
x = 10/(1*2)
x = 5 or x = 5
(x-5)^2 = 0
((x-5)^2)/(x-5) = 0
((x-5)^2)/(x-5) = 0 // * x-5
(x-5)^2 = 0
x-5 = 0 // + 5
x = 5
x in { 5}
x belongs to the empty set
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