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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23*x+3/x-1 = 7 // - 7
23*x+3/x-7-1 = 0
23*x^1+3*x^-1-8*x^0 = 0
(23*x^2-8*x^1+3*x^0)/(x^1) = 0 // * x^2
x^1*(23*x^2-8*x^1+3*x^0) = 0
x^1
23*x^2-8*x+3 = 0
23*x^2-8*x+3 = 0
DELTA = (-8)^2-(3*4*23)
DELTA = -212
DELTA < 0
x in { }
x belongs to the empty set
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