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x in (-oo:+oo)
(1/3)*e^-5*x = 0.9 // - 0.9
(1/3)*e^-5*x-0.9 = 0
1/3*e^-5*x-0.9 = 0 // + 0.9
1/3*e^-5*x = 0.9 // : 1/3*e^-5
x = 0.9/(1/3*e^-5)
x = 2.70000003*e^5
x = 2.70000003*e^5
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