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