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D( x )
ln(x)-5 = 0
x <= 0
ln(x)-5 = 0
ln(x)-5 = 0
ln(x)-5 = 0 // + 5
ln(x) = 5
ln(x) = ln(e^5)
x = e^5
x <= 0
x in (0:e^5) U (e^5:+oo)
(ln(x)-6)/(ln(x)-5) = 5 // - 5
(ln(x)-6)/(ln(x)-5)-5 = 0
k_1 = ln(x)
(k_1-6)/(k_1-5)-5 = 0
(k_1-6)/(k_1-5)+(-5*(k_1-5))/(k_1-5) = 0
k_1-5*(k_1-5)-6 = 0
19-4*k_1 = 0
(19-4*k_1)/(k_1-5) = 0
(19-4*k_1)/(k_1-5) = 0 // * k_1-5
19-4*k_1 = 0
19-4*k_1
19-4*ln(x) = 0 // - 19
-4*ln(x) = -19 // : -4
ln(x) = -19/(-4)
ln(x) = 19/4
ln(x) = ln(e^(19/4))
x = e^(19/4)
x = e^(19/4)
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