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