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t in (-oo:+oo)
6*e^-0.3*t+500/1 = 100 // - 100
6*e^-0.3*t+500/1-100 = 0
6*e^-0.3*t-100+500 = 0
6*e^-0.3*t+400 = 0 // - 400
6*e^-0.3*t = -400 // : 6*e^-0.3
t = -400/(6*e^-0.3)
t = (-200*e^0.3)/3
t = (-200*e^0.3)/3
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