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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
327*x-(4/x)+5 = 0
327*x-4*x^-1+5 = 0
327*x^1-4*x^-1+5*x^0 = 0
(327*x^2+5*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(327*x^2+5*x^1-4*x^0) = 0
x^1
327*x^2+5*x-4 = 0
327*x^2+5*x-4 = 0
DELTA = 5^2-(-4*4*327)
DELTA = 5257
DELTA > 0
x = (5257^(1/2)-5)/(2*327) or x = (-5257^(1/2)-5)/(2*327)
x = (5257^(1/2)-5)/654 or x = (-(5257^(1/2)+5))/654
x in { (-(5257^(1/2)+5))/654, (5257^(1/2)-5)/654}
x in { (-(5257^(1/2)+5))/654, (5257^(1/2)-5)/654 }
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