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D( x )
x = 0
400/A <= 0
1.04/x <= 0
x = 0
x = 0
400/A <= 0
400/A <= 0
400*A^-1 <= 0
x naleu017Cy do R
1.04/x <= 0
1.04/x <= 0
1.04*x^-1 <= 0
1.04*x^-1 <= 0 // : 1.04
x^-1 <= 0/1.04
x^-1 <= 0
1/(x^1) <= 0
x <> 0
1/(x^1) <= 0 // * x^2
(x^2)/(x^1) <= 0
x^1 <= 0
x <= 0
x in (-oo:0)
x belongs to the empty set
ln(400/A) = x*ln(1.04/x)
x belongs to the empty set
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