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D( q )
e^-0.1*q+6 = 0
e^-0.1*q+6 = 0
e^-0.1*q+6 = 0
e^-0.1*q+6 = 0 // - 6
e^-0.1*q = -6 // : e^-0.1
q = -6/(e^-0.1)
q in (-oo:-6/(e^-0.1)) U (-6/(e^-0.1):+oo)
5/(e^-0.1*q+6) = 0
q belongs to the empty set
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