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D( x )
ln(1-x) = 0
1-x <= 0
ln(1-x) = 0
ln(1-x) = 0
ln(1-x) = ln(e^0)
1-x = e^0
1-x-e^0 = 0
-1*x = 0 // : -1
x = 0
1-x <= 0
1-x <= 0
1-x <= 0
-x <= -1 // * -1
x >= 1
x in (-oo:0) U (0:1)
ln(0.5)/ln(1-x) = 2 // - 2
ln(0.5)/ln(1-x)-2 = 0
t_2 = ln(1-x)
ln(0.5)/t_2-2 = 0
ln(0.5)*t_2^-1 = 2 // : ln(0.5)
t_2^-1 = 2/ln(0.5)
-1 < 0
1/(t_2^1) = 2/ln(0.5) // * t_2^1
1 = (2/ln(0.5))*t_2^1 // : 2/ln(0.5)
1/(2/ln(0.5)) = t_2^1
t_2 = 1/(2/ln(0.5))
ln(1-x) = 1/(2/ln(0.5))
ln(1-x) = ln(e^(1/(2/ln(0.5))))
1-x = e^(1/(2/ln(0.5)))
1-x-e^(1/(2/ln(0.5))) = 0 // - 1-e^(1/(2/ln(0.5)))
-x = -(1-e^(1/(2/ln(0.5)))) // * -1
x = 1-e^(1/(2/ln(0.5)))
x = 1-e^(1/(2/ln(0.5)))
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