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n in (-oo:+oo)
2*e^-0.5*n+15/1 = 1.8 // - 1.8
2*e^-0.5*n+15/1-1.8 = 0
2*e^-0.5*n-1.8+15 = 0
2*e^-0.5*n+13.2 = 0 // - 13.2
2*e^-0.5*n = -13.2 // : 2*e^-0.5
n = -13.2/(2*e^-0.5)
n = -6.6*e^0.5
n = -6.6*e^0.5
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