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D( x )
x = 0
780/x <= 0
x = 0
x = 0
780/x <= 0
780/x <= 0
780*x^-1 <= 0
780*x^-1 <= 0 // : 780
x^-1 <= 0/780
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 in (0:+oo)
ln(780/x) = (40700/4.184)*(1/342-(1/373)) // - (40700/4.184)*(1/342-(1/373))
ln(780/x)-((40700/4.184)*(1/342-(1/373))) = 0
ln(780/x)-9727.5334608*(1/342-1/373) = 0
ln(780/x)-2.363887906309008 = 0 // + 2.363887906309008
ln(780/x) = 2.363887906309008
ln(780/x) = ln(e^2.363887906309008)
780/x = e^2.363887906309008
780/x-e^2.363887906309008 = 0
780*x^-1 = e^2.363887906309008 // : 780
x^-1 = (e^2.363887906309008)/780
-1 < 0
1/(x^1) = (e^2.363887906309008)/780 // * x^1
1 = ((e^2.363887906309008)/780)*x^1 // : (e^2.363887906309008)/780
780*e^-2.363887906309008 = x^1
x = 780*e^-2.363887906309008
x = 780*e^-2.363887906309008
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