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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
5/(x^2) = 4/20 // - 4/20
5/(x^2)-(4/20) = 0
5/(x^2)-1/5 = 0
5*x^-2 = 1/5 // : 5
x^-2 = 1/25
-2 < 0
1/(x^2) = 1/25 // * x^2
1 = 1/25*x^2 // : 1/25
25 = x^2
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in { 5, -5 }
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