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D( x )
(2*x^1)/2 = 0
(2*x^1)/2 = 0
(2*x^1)/2 = 0
(2*x)/2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((22*x^3)/7)/((2*x^1)/2) = 0
((22*x^3)/7)/((2*x)/2) = 0
22/7*x^2 = 0 // : 22/7
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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