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