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D( x )
1-x <= 0
1-x <= 0
1-x <= 0
1-x <= 0
-x <= -1 // * -1
x >= 1
x in (-oo:1)
ln(1-x) = 1/4 // - 1/4
ln(1-x)-(1/4) = 0
ln(1-x)-1/4 = 0
ln(1-x)-1/4 = 0 // + 1/4
ln(1-x) = 1/4
ln(1-x) = ln(e^(1/4))
1-x = e^(1/4)
1-x-e^(1/4) = 0 // - 1-e^(1/4)
-x = -(1-e^(1/4)) // * -1
x = 1-e^(1/4)
x = 1-e^(1/4)
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