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D( x )
5*x-1 <= 0
5*x-1 <= 0
5*x-1 <= 0
5*x-1 <= 0 // + 1
5*x <= 1 // : 5
x <= 1/5
x in (1/5:+oo)
ln(5*x-1) = 1/9 // - 1/9
ln(5*x-1)-(1/9) = 0
ln(5*x-1)-1/9 = 0
ln(5*x-1)-1/9 = 0 // + 1/9
ln(5*x-1) = 1/9
ln(5*x-1) = ln(e^(1/9))
5*x-1 = e^(1/9)
5*x-e^(1/9)-1 = 0 // + e^(1/9)+1
5*x = e^(1/9)+1 // : 5
x = (e^(1/9)+1)/5
x = (e^(1/9)+1)/5
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