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D( x )
x = 0
x^2-25 = 0
x = 0
x = 0
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 (-5:0) U (0:5) U (5:+oo)
1/x+1/x-5+5 = (2*x+1)/(x^2-25) // - (2*x+1)/(x^2-25)
1/x-((2*x+1)/(x^2-25))+1/x-5+5 = 0
(-1*(2*x+1))/(x^2-25)+1/x+1/x-5+5 = 0
(-1*x*(2*x+1))/(x*(x^2-25))+(1*(x^2-25))/(x*(x^2-25))+(1*(x^2-25))/(x*(x^2-25))+(-5*x*(x^2-25))/(x*(x^2-25))+(5*x*(x^2-25))/(x*(x^2-25)) = 0
1*(x^2-25)-1*x*(2*x+1)+1*(x^2-25)-5*x*(x^2-25)+5*x*(x^2-25) = 0
5*x^3-5*x^3-x^2+x^2-x+125*x-125*x-25-25 = 0
5*x^3-5*x^3-x+125*x-125*x-50 = 0
5*x^3-5*x^3+124*x-125*x-50 = 0
-x-50 = 0
(-x-50)/(x*(x^2-25)) = 0
(-x-50)/(x*(x^2-25)) = 0 // * x*(x^2-25)
-x-50 = 0
-x-50 = 0 // + 50
-x = 50 // * -1
x = -50
x = -50
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