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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)
x+3*x-(5/(x^2)) = 0
x+3*x-5*x^-2 = 0
4*x-5*x^-2 = 0
x*(4-5*x^-3) = 0
-5*x^-3 = -4 // : -5
x^-3 = 4/5
-3 < 0
1/(x^3) = 4/5 // * x^3
1 = 4/5*x^3 // : 4/5
5/4 = x^3
x^3 = 5/4 // ^ 1/3
x = (5/4)^(1/3)
x = 0
x = 0
x in { 0}
x = (5/4)^(1/3)
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