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D( x )
x/0.15 <= 0
x/0.15 <= 0
x/0.15 <= 0
6.66666667*x+0 <= 0 // - 0
6.66666667*x <= 0 // : 6.66666667
x <= 0/6.66666667
x <= 0
x in (0:+oo)
ln(x/0.15) = 0
ln(x/0.15) = ln(e^0)
x/0.15 = e^0
x/0.15-e^0 = 0
6.66666667*x-1 = 0 // + 1
6.66666667*x = 1 // : 6.66666667
x = 1/6.66666667
x = 0.15
x = 0.15
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