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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/6)*x+(1/5)*x = 1/30-(1/x) // - 1/30-(1/x)
(1/6)*x+(1/5)*x+1/x-(1/30) = 0
(1/6)*x+(1/5)*x+1/x-1/30 = 0
11/30*x^1+1*x^-1-1/30*x^0 = 0
(11/30*x^2-1/30*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(11/30*x^2-1/30*x^1+1*x^0) = 0
x^1
(11/30)*x^2+(-1/30)*x+1 = 0
(11/30)*x^2+(-1/30)*x+1 = 0
DELTA = (-1/30)^2-(1*4*(11/30))
DELTA = -1319/900
DELTA < 0
x in { }
x belongs to the empty set
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