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x in (-oo:+oo)
e^-0.2*x = 1/2 // - 1/2
e^-0.2*x-(1/2) = 0
e^-0.2*x-1/2 = 0
e^-0.2*x-1/2 = 0 // + 1/2
e^-0.2*x = 1/2 // : e^-0.2
x = 1/2/(e^-0.2)
x = 1/2/(e^-0.2)
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