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D( x )
(7/3)*x = 0
x = 0
(7/3)*x = 0
(7/3)*x = 0
7/3*x = 0 // : 7/3
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/x)/((7/3)*x) = 0
12/7*x^-2 = 0 // : 12/7
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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