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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(11*(9/x))/3 = 5/x // - 5/x
(11*(9/x))/3-(5/x) = 0
(11*(9/x))/3-5*x^-1 = 0
28*x^-1 = 0 // : 28
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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