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D( x )
x^2+8*x+23 = 0
x^2+8*x+23 = 0
x^2+8*x+23 = 0
x^2+8*x+23 = 0
DELTA = 8^2-(1*4*23)
DELTA = -28
DELTA < 0
x in (-oo:+oo)
7/(x^2+8*x+23) = 1 // - 1
7/(x^2+8*x+23)-1 = 0
x^2+8*x+23 = 0
x^2+8*x+23 = 0
x^2+8*x+23 = 0
DELTA = 8^2-(1*4*23)
DELTA = -28
DELTA < 0
1 = 0
7-1 = 0
7-1 = 0
6 = 0
6 = 0
x belongs to the empty set
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