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5.3=(x-y*e^(-z))/z, 7.7=(x-y*e^(-3z))/z, 8.95=(x-y*e^(-5z))/z
5.3=(x-y*e^(-z))/z, 7.7=(x-y*e^(-3z))/z, 8.95=(x-y*e^(-5z))/z
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