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D( x )
x/71 <= 0
x/71 <= 0
x/71 <= 0
1/71*x+0 <= 0 // - 0
1/71*x <= 0 // : 1/71
x <= 0/1/71
x <= 0
x in (0:+oo)
ln(x/71) = -2.3429 // + 2.3429
ln(x/71)+2.3429 = 0
ln(x/71)+2.3429 = 0 // - 2.3429
ln(x/71) = -2.3429
ln(x/71) = ln(e^-2.3429)
x/71 = e^-2.3429
x/71-e^-2.3429 = 0
1/71*x-e^-2.3429 = 0 // + e^-2.3429
1/71*x = e^-2.3429 // : 1/71
x = (e^-2.3429)/1/71
x = 71*e^-2.3429
x = 71*e^-2.3429
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