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D( x )
2*x <= 0
2*x <= 0
2*x <= 0
2*x+0 <= 0 // - 0
2*x <= 0 // : 2
x <= 0/2
x <= 0
x in (0:+oo)
ln(2*x) = 15/7 // - 15/7
ln(2*x)-(15/7) = 0
ln(2*x)-15/7 = 0
ln(2*x)-15/7 = 0 // + 15/7
ln(2*x) = 15/7
ln(2*x) = ln(e^(15/7))
2*x = e^(15/7)
2*x-e^(15/7) = 0 // + e^(15/7)
2*x = e^(15/7) // : 2
x = (e^(15/7))/2
x = (e^(15/7))/2
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