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D( x )
x-5 = 0
x^2-25 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x^2-25 = 0
x^2-25 = 0
1*x^2 = 25 // : 1
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in (-oo:-5) U (-5:5) U (5:+oo)
1/(x-5) = x/(x^2-25) // - x/(x^2-25)
1/(x-5)-(x/(x^2-25)) = 0
1/(x-5)+(-1*x)/(x^2-25) = 0
(1*(x^2-25))/((x-5)*(x^2-25))+(-1*x*(x-5))/((x-5)*(x^2-25)) = 0
1*(x^2-25)-1*x*(x-5) = 0
5*x-25 = 0
(5*x-25)/((x-5)*(x^2-25)) = 0
(5*x-25)/((x-5)*(x^2-25)) = 0 // * (x-5)*(x^2-25)
5*x-25 = 0
5*x-25 = 0 // + 25
5*x = 25 // : 5
x = 25/5
x = 5
x in { 5}
x belongs to the empty set
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