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D( x )
3*x+8 <= 0
3*x+8 <= 0
3*x+8 <= 0
3*x+8 <= 0 // - 8
3*x <= -8 // : 3
x <= -8/3
x in (-8/3:+oo)
5*ln(3*x+8) = 14/5 // - 14/5
5*ln(3*x+8)-(14/5) = 0
5*ln(3*x+8)-14/5 = 0
5*ln(3*x+8)-14/5 = 0 // + 14/5
5*ln(3*x+8) = 14/5 // : 5
ln(3*x+8) = 14/5/5
ln(3*x+8) = 14/25
ln(3*x+8) = ln(e^(14/25))
3*x+8 = e^(14/25)
3*x-e^(14/25)+8 = 0 // - 8-e^(14/25)
3*x = -(8-e^(14/25)) // : 3
x = (-(8-e^(14/25)))/3
x = (e^(14/25)-8)/3
x = (e^(14/25)-8)/3
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