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D( x )
5*x-4 <= 0
5*x-4 <= 0
5*x-4 <= 0
5*x-4 <= 0 // + 4
5*x <= 4 // : 5
x <= 4/5
x in (4/5:+oo)
((ln(5*x-4))^1)/3 = 0
ln(5*x-4)/3 = 0
1/3*ln(5*x-4) = 0 // : 1/3
ln(5*x-4) = 0
ln(5*x-4) = ln(e^0)
5*x-4 = e^0
5*x-e^0-4 = 0
5*x-5 = 0 // + 5
5*x = 5 // : 5
x = 5/5
x = 1
x = 1
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