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D( k )
k = 0
7/k <= 0
k = 0
k = 0
7/k <= 0
7/k <= 0
7*k^-1 <= 0
7*k^-1 <= 0 // : 7
k^-1 <= 0/7
k^-1 <= 0
1/(k^1) <= 0
k <> 0
1/(k^1) <= 0 // * k^2
(k^2)/(k^1) <= 0
k^1 <= 0
k <= 0
k in (-oo:0)
k in (0:+oo)
ln(7/k) = 56.626 // - 56.626
ln(7/k)-56.626 = 0
ln(7/k)-56.626 = 0 // + 56.626
ln(7/k) = 56.626
ln(7/k) = ln(e^56.626)
7/k = e^56.626
7/k-e^56.626 = 0
7*k^-1 = e^56.626 // : 7
k^-1 = (e^56.626)/7
-1 < 0
1/(k^1) = (e^56.626)/7 // * k^1
1 = ((e^56.626)/7)*k^1 // : (e^56.626)/7
7*e^-56.626 = k^1
k = 0
k in { 0}
k belongs to the empty set
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