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