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D( x )
(49/9)*x^3 = 0
(49/9)*x^3 = 0
(49/9)*x^3 = 0
49/9*x^3 = 0 // : 49/9
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
((6*x)/35)/((49/9)*x^3) = 0
54/1715*x^-2 = 0 // : 54/1715
x^-2 = 0
x należy do O
x belongs to the empty set
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