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D( x )
x = 0
(10/3)*x = 0
x = 0
x = 0
(10/3)*x = 0
(10/3)*x = 0
10/3*x = 0 // : 10/3
x = 0
x in (-oo:0) U (0:+oo)
(30*x+15/x)/((10/3)*x) = 0
(30*x+15*x^-1)/(10/3*x) = 0
30*x+15*x^-1 = 0
15*x^-1*(2*x^2+1) = 0
2*x^2 = -1 // : 2
x^2 = -1/2
15/x = 0
(15*x^-1)/(10/3*x) = 0
15*x^-1 = 0 // : 15
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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