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D( x )
x/2.13 <= 0
x/2.13 <= 0
x/2.13 <= 0
0.46948357*x+0 <= 0 // - 0
0.46948357*x <= 0 // : 0.46948357
x <= 0/0.46948357
x <= 0
x in (0:+oo)
ln(x/2.13) = 0
ln(x/2.13) = ln(e^0)
x/2.13 = e^0
x/2.13-e^0 = 0
0.46948357*x-1 = 0 // + 1
0.46948357*x = 1 // : 0.46948357
x = 1/0.46948357
x = 2.12999999
x = 2.12999999
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