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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45/x = 5/5000-x // - 5/5000-x
x+45/x-(5/5000) = 0
x+45/x-1/1000 = 0
1*x^1+45*x^-1-1/1000*x^0 = 0
(1*x^2-1/1000*x^1+45*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-1/1000*x^1+45*x^0) = 0
x^1
x^2+(-1/1000)*x+45 = 0
x^2+(-1/1000)*x+45 = 0
DELTA = (-1/1000)^2-(1*4*45)
DELTA = -179999999/1000000
DELTA < 0
x in { }
x belongs to the empty set
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