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x in (-oo:+oo)
ln(0.99) = -x/5 // + -x/5
ln(0.99)-(-x/5) = 0
(1/5)*x+ln(0.99) = 0
1/5*x+ln(0.99) = 0 // - ln(0.99)
1/5*x = -ln(0.99) // : 1/5
x = -ln(0.99)/1/5
x = -5*ln(0.99)
x = -5*ln(0.99)
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