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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x+6/x+5 = 0
2*x^1+6*x^-1+5*x^0 = 0
(2*x^2+5*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2+5*x^1+6*x^0) = 0
x^1
2*x^2+5*x+6 = 0
2*x^2+5*x+6 = 0
DELTA = 5^2-(2*4*6)
DELTA = -23
DELTA < 0
x in { }
x belongs to the empty set
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