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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*((x^-1)/3)*(x^2-9) = 0
2/9*x^-1*(x^2-9) = 0
( 2/9*x^-1 )
2/9*x^-1 = 0 // : 2/9
x^-1 = 0
x należy do O
( x^2-9 )
1*x^2 = 9 // : 1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3, -3 }
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