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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(6*x^2+35*x+25)/(x+5) = 0
6*x^2+35*x+25 = 0
6*x^2+35*x+25 = 0
DELTA = 35^2-(4*6*25)
DELTA = 625
DELTA > 0
x = (625^(1/2)-35)/(2*6) or x = (-625^(1/2)-35)/(2*6)
x = -5/6 or x = -5
(x+5)*(x+5/6) = 0
x+5/6 = 0
x+5/6 = 0 // - 5/6
x = -5/6
x = -5/6
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