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D( x )
x-(8/5) <= 0
x-(8/5) <= 0
x-(8/5) <= 0
x-8/5 <= 0
x-8/5 <= 0 // + 8/5
x <= 8/5
x in (8/5:+oo)
6*ln(x-(8/5)) = 298 // - 298
6*ln(x-(8/5))-298 = 0
6*ln(x-8/5)-298 = 0
6*ln(x-8/5)-298 = 0 // + 298
6*ln(x-8/5) = 298 // : 6
ln(x-8/5) = 298/6
ln(x-8/5) = 149/3
ln(x-8/5) = ln(e^(149/3))
x-8/5 = e^(149/3)
x-e^(149/3)-8/5 = 0 // + e^(149/3)+8/5
x = e^(149/3)+8/5
x = e^(149/3)+8/5
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