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D( x )
9*x-8 = 0
9*x-8 = 0
9*x-8 = 0
9*x-8 = 0 // + 8
9*x = 8 // : 9
x = 8/9
x in (-oo:8/9) U (8/9:+oo)
(27*x^2-(24*x)+10)/(9*x-8) = 0
(27*x^2-24*x+10)/(9*x-8) = 0
27*x^2-24*x+10 = 0
27*x^2-24*x+10 = 0
DELTA = (-24)^2-(4*10*27)
DELTA = -504
DELTA < 0
1 = 0
1/(9*x-8) = 0
x belongs to the empty set
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