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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/x)/(-3) = 2*x // - 2*x
(9/x)/(-3)-(2*x) = 0
(9/x)/(-3)-2*x = 0
-2*x^1-3*x^-1 = 0
(-2*x^2-3*x^0)/(x^1) = 0 // * x^2
x^1*(-2*x^2-3*x^0) = 0
x^1
-2*x^2-3 = 0
-2*x^2-3 = 0
DELTA = 0^2-(-3*(-2)*4)
DELTA = -24
DELTA < 0
x in { }
x belongs to the empty set
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