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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+2/x+3 = 0
1*x^1+2*x^-1+3*x^0 = 0
(1*x^2+3*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+3*x^1+2*x^0) = 0
x^1
x^2+3*x+2 = 0
x^2+3*x+2 = 0
DELTA = 3^2-(1*2*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-3)/(1*2) or x = (-1^(1/2)-3)/(1*2)
x = -1 or x = -2
x in { -2, -1}
x in { -2, -1 }
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