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