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