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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)
6*x+4*x+24/(x^2) = 0
10*x+24*x^-2 = 0
2*x*(12*x^-3+5) = 0
12*x^-3 = -5 // : 12
x^-3 = -5/12
-3 < 0
1/(x^3) = -5/12 // * x^3
1 = -5/12*x^3 // : -5/12
-12/5 = x^3
x^3 = -12/5 // ^ 1/3
x = -(12/5)^(1/3)
2*x = 0
2*x = 0 // : 2
x = 0
x in { 0}
x = -(12/5)^(1/3)
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