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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x^1)/3+(4*x^-5)/3 = 0
(8*x)/3+(4*x^-5)/3 = 0
8/3*x+4/3*x^-5 = 0
4/3*x*(x^-6+2) = 0
1*x^-6 = -2 // : 1
x^-6 = -2
-6 < 0
1/(x^6) = -2 // * x^6
1 = -2*x^6 // : -2
-1/2 = x^6
(4*x)/3 = 0
4/3*x = 0 // : 4/3
x = 0
x in { 0}
x belongs to the empty set
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