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D( x )
6*x+5 = 0
6*x+5 = 0
6*x+5 = 0
6*x+5 = 0 // - 5
6*x = -5 // : 6
x = -5/6
x in (-oo:-5/6) U (-5/6:+oo)
(18*x^2-(3*x)+4)/(6*x+5) = 0
(18*x^2-3*x+4)/(6*x+5) = 0
18*x^2-3*x+4 = 0
18*x^2-3*x+4 = 0
DELTA = (-3)^2-(4*4*18)
DELTA = -279
DELTA < 0
1 = 0
1/(6*x+5) = 0
x belongs to the empty set
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