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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+8/x-3 = 5/2 // - 5/2
x+8/x-(5/2)-3 = 0
x+8/x-5/2-3 = 0
1*x^1+8*x^-1-11/2*x^0 = 0
(1*x^2-11/2*x^1+8*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-11/2*x^1+8*x^0) = 0
x^1
x^2+(-11/2)*x+8 = 0
x^2+(-11/2)*x+8 = 0
DELTA = (-11/2)^2-(1*4*8)
DELTA = -7/4
DELTA < 0
x in { }
x belongs to the empty set
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