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D( x )
x/1.5 <= 0
x/1.5 <= 0
x/1.5 <= 0
0.66666667*x+0 <= 0 // - 0
0.66666667*x <= 0 // : 0.66666667
x <= 0/0.66666667
x <= 0
x in (0:+oo)
ln(x/1.5) = 2.5 // - 2.5
ln(x/1.5)-2.5 = 0
ln(x/1.5)-2.5 = 0 // + 2.5
ln(x/1.5) = 2.5
ln(x/1.5) = ln(e^2.5)
x/1.5 = e^2.5
x/1.5-e^2.5 = 0
0.66666667*x-e^2.5 = 0 // + e^2.5
0.66666667*x = e^2.5 // : 0.66666667
x = (e^2.5)/0.66666667
x = 1.49999999*e^2.5
x = 1.49999999*e^2.5
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