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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+1/x+2 = 0
1*x^1+1*x^-1+2*x^0 = 0
(1*x^2+2*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+2*x^1+1*x^0) = 0
x^1
x^2+2*x+1 = 0
x^2+2*x+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
x = -2/(1*2)
x = -1 or x = -1
x in { -1, -1}
x in { -1, -1 }
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