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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(5/x)-3 = 3/10 // - 3/10
x-(5/x)-(3/10)-3 = 0
x-5*x^-1-3/10-3 = 0
1*x^1-5*x^-1-33/10*x^0 = 0
(1*x^2-33/10*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-33/10*x^1-5*x^0) = 0
x^1
x^2+(-33/10)*x-5 = 0
x^2+(-33/10)*x-5 = 0
DELTA = (-33/10)^2-(-5*1*4)
DELTA = 3089/100
DELTA > 0
x = ((3089/100)^(1/2)-(-33/10))/(1*2) or x = (-(-33/10)-(3089/100)^(1/2))/(1*2)
x = ((3089/100)^(1/2)+33/10)/2 or x = (33/10-(3089/100)^(1/2))/2
x in { (33/10-(3089/100)^(1/2))/2, ((3089/100)^(1/2)+33/10)/2}
x in { (33/10-(3089/100)^(1/2))/2, ((3089/100)^(1/2)+33/10)/2 }
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