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D( x )
x < 0
9*x < 0
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)+5*x^(1/2) = 0
8*x^(1/2) = 0 // : 8
x^(1/2) = 0
x = 0
x = 0
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