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D( x )
x/293 <= 0
x/293 <= 0
x/293 <= 0
1/293*x+0 <= 0 // - 0
1/293*x <= 0 // : 1/293
x <= 0/1/293
x <= 0
x in (0:+oo)
1.39 = ln(x/293) // - ln(x/293)
1.39-ln(x/293) = 0
1.39-ln(x/293) = 0 // - 1.39
-ln(x/293) = -1.39
-ln(x/293) = -1.39 // * -1
ln(x/293) = ln(e^1.39)
x/293 = e^1.39
x/293-e^1.39 = 0
1/293*x-e^1.39 = 0 // + e^1.39
1/293*x = e^1.39 // : 1/293
x = (e^1.39)/1/293
x = 293*e^1.39
x = 293*e^1.39
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