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D( x )
(3*x)^-2 = 0
3*x = 0
5*x = 0
(3*x)^-2 = 0
(3*x)^-2 = 0
1/9*x^-2 = 0 // : 1/9
x^-2 = 0
x naleu017Cy do O
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
((5*x)^-3)/((3*x)^-2) = 0
9/125*x^-1 = 0 // : 9/125
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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