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D( x )
3*x <= 0
3*x <= 0
3*x <= 0
3*x+0 <= 0 // - 0
3*x <= 0 // : 3
x <= 0/3
x <= 0
x in (0:+oo)
ln(3*x) = 15/7 // - 15/7
ln(3*x)-(15/7) = 0
ln(3*x)-15/7 = 0
ln(3*x)-15/7 = 0 // + 15/7
ln(3*x) = 15/7
ln(3*x) = ln(e^(15/7))
3*x = e^(15/7)
3*x-e^(15/7) = 0 // + e^(15/7)
3*x = e^(15/7) // : 3
x = (e^(15/7))/3
x = (e^(15/7))/3
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