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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
11*X+90000/X = 0
11*X^1+90000*X^-1 = 0
(11*X^2+90000*X^0)/(X^1) = 0 // * X^2
X^1*(11*X^2+90000*X^0) = 0
X^1
11*X^2+90000 = 0
11*X^2+90000 = 0
DELTA = 0^2-(4*11*90000)
DELTA = -3960000
DELTA < 0
X in { }
X belongs to the empty set
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