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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^3)/2)/x-6 = x-8 // - x-8
((x^3)/2)/x-x-6+8 = 0
1/2*x^2-x+2 = 0
DELTA = (-1)^2-(1/2*2*4)
DELTA = -3
DELTA < 0
x belongs to the empty set
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