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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(9*w)-((53/11)*w)-(9/w) = 0
w-9*w+(-53/11)*w-9*w^-1 = 0
-141/11*w^1-9*w^-1 = 0
(-141/11*w^2-9*w^0)/(w^1) = 0 // * w^2
w^1*(-141/11*w^2-9*w^0) = 0
w^1
(-141/11)*w^2-9 = 0
(-141/11)*w^2-9 = 0
DELTA = 0^2-(-9*4*(-141/11))
DELTA = -5076/11
DELTA < 0
w in { }
w belongs to the empty set
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