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