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D( x )
1-(e^-8*x) <= 0
1-(e^-8*x) <= 0
1-(e^-8*x) <= 0
1-e^-8*x <= 0 // - 1
-e^-8*x <= -1 // : -e^-8
x >= -1/(-e^-8)
x >= 1/(e^-8)
x in (-oo:1/(e^-8))
ln(1/2) = ln(1-(e^-8*x)) // - ln(1-(e^-8*x))
ln(1/2)-ln(1-(e^-8*x)) = 0
ln(1/2)-ln(1-(e^-8*x)) = 0 // - ln(1/2)
-ln(1-(e^-8*x)) = -ln(1/2)
-ln(1-(e^-8*x)) = -ln(1/2) // * -1
1-(e^-8*x) = 1/2
1-(e^-8*x)-1/2 = 0
1/2-e^-8*x = 0 // - 1/2
-e^-8*x = -1/2 // : -e^-8
x = -1/2/(-e^-8)
x = 1/2/(e^-8)
x = 1/2/(e^-8)
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