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D( x )
5*x^2-1 = 0
x-1 = 0
5*x^2-1 = 0
5*x^2-1 = 0
5*x^2 = 1 // : 5
x^2 = 1/5
x^2 = 1/5 // ^ 1/2
abs(x) = (1/5)^(1/2)
x = (1/5)^(1/2) or x = -(1/5)^(1/2)
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-(1/5)^(1/2)) U (-(1/5)^(1/2):(1/5)^(1/2)) U ((1/5)^(1/2):1) U (1:+oo)
5/(5*x^2-1) = 1/(x-1) // - 1/(x-1)
5/(5*x^2-1)-(1/(x-1)) = 0
5/(5*x^2-1)-(x-1)^-1 = 0
5/(5*x^2-1)-1/(x-1) = 0
(5*(x-1))/((5*x^2-1)*(x-1))+(-1*(5*x^2-1))/((5*x^2-1)*(x-1)) = 0
5*(x-1)-1*(5*x^2-1) = 0
5*x-5*x^2-4 = 0
5*x-5*x^2-4 = 0
5*x-5*x^2-4 = 0
DELTA = 5^2-(-5*(-4)*4)
DELTA = -55
DELTA < 0
1 = 0
1/((5*x^2-1)*(x-1)) = 0
1/((5*x^2-1)*(x-1)) = 0 // * (5*x^2-1)*(x-1)
1 = 0
x belongs to the empty set
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