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q in (-oo:+oo)
130 = 420*(1-(e^-0.1*q)-(5/6)) // - 420*(1-(e^-0.1*q)-(5/6))
130-(420*(1-(e^-0.1*q)-(5/6))) = 0
130-420*(1-(e^-0.1*q)-5/6) = 0
130-420*(1/6-e^-0.1*q) = 0
130-420*(1/6-e^-0.1*q) = 0
420*e^-0.1*q+60 = 0
420*e^-0.1*q+60 = 0
420*e^-0.1*q+60 = 0 // - 60
420*e^-0.1*q = -60 // : 420*e^-0.1
q = -60/(420*e^-0.1)
q = (-e^0.1)/7
q = (-e^0.1)/7
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